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downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/README.md

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+# Siemens NX Master Skeleton — Version 0.2
+
+This package defines the controlled top-down geometry for ASTERION FCTA-1.
+
+## Included
+
+- Named expression seed file
+- Stable vehicle station table
+- Coordinate-system table
+- Interface-point table
+- Keep-out envelope table
+- WAVE publication map
+- NX assembly and layer standards
+- Detailed NX build tutorial
+- NXOpen wireframe journal starter
+- Neutral GLB, STL, and OBJ envelope geometry
+- Separate subsystem STL envelopes
+- Plan and front-view DXF/SVG references
+- Model-audit checklist
+
+## Correct use
+
+1. Create a new metric NX part named `AST-0000-MASTER-SKELETON.prt`.
+2. Build native NX datums and expressions using the tutorial.
+3. Use the included journal only as a wireframe accelerator, not as the final feature tree.
+4. Import neutral geometry into a reference-only part or reference set.
+5. Create detailed parts by WAVE-linking approved skeleton objects.
+6. Do not let detailed parts drive master geometry.
+
+## Limitation
+
+Native `.prt` files cannot be authored or validated here because Siemens NX is not installed in this environment. The neutral geometry and NXOpen journal provide reproducible inputs for the native build on your PC.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/assembly_tree.md

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+# NX Assembly Tree — Version 0.2
+
+```text
+AST-0000-VEHICLE-ASSY
+├── AST-0001-MASTER-SKELETON
+├── AST-1000-PRIMARY-STRUCTURE-ASSY
+│   ├── AST-1100-SPINE-ASSY
+│   ├── AST-1200-RING-A-SUPPORT-ASSY
+│   └── AST-1300-RING-B-SUPPORT-ASSY
+├── AST-2000-HABITATION-ASSY
+│   ├── AST-2100-RING-A-ASSY
+│   └── AST-2200-RING-B-ASSY
+├── AST-3000-POWER-THERMAL-ASSY
+│   ├── AST-3100-SOLAR-WING-PY
+│   ├── AST-3200-SOLAR-WING-NY
+│   ├── AST-3300-SOLAR-WING-PZ
+│   ├── AST-3400-SOLAR-WING-NZ
+│   └── AST-3500-RADIATOR-ASSY
+├── AST-4000-PROPULSION-ASSY
+│   └── AST-4101..4106-PROPULSION-PODS
+├── AST-5000-COMMAND-SERVICE-ASSY
+├── AST-6000-DOCKING-ASSY
+└── AST-7000-SKIMMER-ASSY
+```
+
+## Loading rule
+
+Use lightweight or partial loading for detail-heavy subassemblies. Keep the master skeleton and the active work package fully loaded.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/coordinate_systems.csv

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+csys_id,x_mm,y_mm,z_mm,x_axis,y_axis,z_axis,purpose
+CSYS_VEHICLE,0,0,0,+X forward,+Y starboard,+Z up,Global design coordinate system
+CSYS_RING_A,-2500,0,0,+X,+Y,+Z,Ring A centre and rotation axis
+CSYS_RING_B,2500,0,0,+X,+Y,+Z,Ring B centre and rotation axis
+CSYS_SOLAR,9000,0,0,+X,+Y,+Z,Solar wing hinge reference
+CSYS_SKIMMER_DOCK,21000,0,0,+X,+Y,+Z,Skimmer docking interface

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/interface_points.csv

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+interface_id,x_mm,y_mm,z_mm,normal,interface_type,nominal_diameter_mm
+IF_POD_01,-16000,3000.0,0.0,+X,propulsion pod gimbal,1240
+IF_POD_02,-16000,1500.0,2598.076,+X,propulsion pod gimbal,1240
+IF_POD_03,-16000,-1500.0,2598.076,+X,propulsion pod gimbal,1240
+IF_POD_04,-16000,-3000.0,0.0,+X,propulsion pod gimbal,1240
+IF_POD_05,-16000,-1500.0,-2598.076,+X,propulsion pod gimbal,1240
+IF_POD_06,-16000,1500.0,-2598.076,+X,propulsion pod gimbal,1240
+IF_RING_A_BEARING,-2500,0,0,+X,rotating ring bearing,2400
+IF_RING_B_BEARING,2500,0,0,+X,rotating ring bearing,2400
+IF_SKIMMER_DOCK,21000,0,0,+X,docking interface,1600
+IF_AFT_DOCK,-8000,0,0,-X,logistics docking interface,1600

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/keepout_envelopes.csv

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+zone_id,shape,origin_x_mm,origin_y_mm,origin_z_mm,dim_1_mm,dim_2_mm,description
+KO_RING_A_ROTATION,cylinder,-2500,0,0,14000,3600,Ring A rotating envelope plus preliminary clearance
+KO_RING_B_ROTATION,cylinder,2500,0,0,14000,3600,Ring B rotating envelope plus preliminary clearance
+KO_SKIMMER,box,25000,0,0,9000,6500,Skimmer docking and separation envelope; height 3.0 m
+KO_SOLAR_SPAN,box,9000,0,0,5000,60000,Solar array deployment envelope; symmetric in Y and Z
+KO_THRUSTER_PLUMES,cone_set,-21000,0,0,12000,15,Six conceptual plume cones; dim_2 is half-angle in degrees

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/layers_reference_sets.md

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+# NX Layers and Reference Sets
+
+## Layers
+
+| Layer | Purpose |
+|---:|---|
+| 1 | Current solid or active construction geometry |
+| 10 | Vehicle axes, station references, global datums |
+| 20 | Habitation-ring envelopes and rotation axes |
+| 30 | Solar-array hinges, panels, swept envelopes |
+| 40 | Propulsion interfaces, pod axes, plume keep-outs |
+| 50 | Skimmer envelope, control surfaces, docking geometry |
+| 60 | Radiator envelopes and thermal interfaces |
+| 70 | Maintenance, robotic-access and removal envelopes |
+| 80 | Interface-control geometry and bolt circles |
+| 90 | Imported neutral reference geometry |
+| 200–219 | Construction and temporary geometry |
+
+## Reference sets
+
+- `EMPTY`: no visible geometry.
+- `SKELETON`: approved datums, axes, curves, points and interface sketches.
+- `ENVELOPES`: simplified subsystem and keep-out bodies.
+- `INTERFACES`: interface points, planes and bolt circles only.
+- `MODEL`: all approved master-model objects.
+
+Neutral STL/OBJ geometry must remain on reference layer 90 and must never become the associative design authority.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/nx_build_tutorial.md

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+# Siemens NX Build Tutorial — ASTERION Master Skeleton V0.2
+
+## 1. Create the native part
+
+Create a new millimetre part named `AST-0001-MASTER-SKELETON.prt`. Set the absolute coordinate system so +X is forward, +Y is starboard and +Z is up. Save the part before constructing geometry.
+
+## 2. Add global expressions
+
+Open the Expressions tool and create the variables from `nx_expressions_v0_2.txt`. Depending on the NX release, use expression import or paste the entries manually. Confirm that all length expressions use millimetres, all angles use degrees, and the rotation speed uses rpm.
+
+Do not replace formulas such as `ring_major_radius = ring_outer_radius - ring_minor_radius` with fixed numbers.
+
+## 3. Create stable station datums
+
+Create eight datum planes normal to the X-axis at STA_00 through STA_70. Name them exactly `DP_STA_00` through `DP_STA_70`. Drive each offset with its matching station expression.
+
+Create the vehicle centreline and name it `AXIS_VEHICLE_X`.
+
+## 4. Construct the spine envelope
+
+Create a revolved or extruded cylindrical envelope with radius `spine_outer_radius` between STA_00 and STA_70. Create a second reference cylinder at `spine_truss_radius`. Keep both as construction or envelope objects rather than production solids.
+
+## 5. Construct the ring envelopes
+
+At `DP_STA_30` and `DP_STA_40`, sketch concentric circles using `ring_outer_radius` and `ring_major_radius - ring_minor_radius`. Extrude or sweep the envelope symmetrically to `ring_axial_width`.
+
+Create 12 radial sector lines at `ring_sector_angle`. The sector geometry is the publication authority for repeated ring modules.
+
+## 6. Construct solar-wing envelopes
+
+At STA_50, create four radial hinge axes. The total tip-to-tip span is controlled by `solar_deployed_span`. Each wing consists of:
+
+- a boom of length `solar_boom_length`, and
+- an active panel region of length `solar_active_panel_length`.
+
+Create stowed and deployed arrangements. Add a swept keep-out body through the deployment angle.
+
+## 7. Construct radiator envelopes
+
+Create six radiator hinge coordinate systems equally spaced around the X-axis. Build one panel envelope and pattern it six times. Keep the panel length aligned primarily with X and use `radiator_radial_offset` for clearance from the rings and spine.
+
+## 8. Construct propulsion interfaces
+
+At STA_10, create six coordinate systems at `propulsion_pod_radial_offset`. Pattern them at 60°. Create pod interface circles and axis lines. Add six plume keep-out cones beginning at the aft exit plane; the cones are clearance objects only.
+
+## 9. Construct the Skimmer interface
+
+At STA_70, create the docking plane and a `primary_docking_diameter` interface circle. Build the Skimmer as a reference envelope extending forward. The neutral model is only a placeholder: the detailed Skimmer must later be rebuilt with Studio Surface, Through Curves and curvature-continuity checks.
+
+## 10. Publish geometry for WAVE linking
+
+Create or organise named objects matching `wave_publication_map.csv`. Only approved centreline, datums, envelopes, interfaces and keep-outs may be linked into downstream parts.
+
+## 11. Create arrangements
+
+Create at least:
+
+- `ARR_STOWED`
+- `ARR_SOLAR_DEPLOYED`
+- `ARR_RADIATORS_DEPLOYED`
+- `ARR_ALL_DEPLOYED`
+- `ARR_SKIMMER_SEPARATED`
+
+## 12. Audit before release
+
+Run the checklist in `nx_model_audit_checklist.md`. Export a Parasolid or STEP reference if your NX licence permits, plus JT or glTF for review. Record the NX release used and the exact export settings.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/nx_expressions_v0_2.txt

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+# ASTERION NX MASTER SKELETON EXPRESSIONS — VERSION 0.2
+# Units: millimetres, degrees, revolutions per minute unless noted.
+# Create these as named NX expressions. Derived values should remain formula-driven.
+
+project_version = 0.2
+vehicle_length = 42000 mm
+vehicle_half_length = vehicle_length / 2
+spine_outer_radius = 900 mm
+spine_truss_radius = 1200 mm
+service_tunnel_diameter = 1200 mm
+primary_docking_diameter = 1600 mm
+
+ring_outer_diameter = 26000 mm
+ring_outer_radius = ring_outer_diameter / 2
+ring_minor_radius = 1000 mm
+ring_major_radius = ring_outer_radius - ring_minor_radius
+ring_occupied_radius = 12000 mm
+ring_axial_width = 3200 mm
+ring_sector_count = 12
+ring_sector_angle = 360 deg / ring_sector_count
+ring_a_station = -2500 mm
+ring_b_station = 2500 mm
+ring_spacing = ring_b_station - ring_a_station
+ring_rotation_speed = 4.3 rpm
+ring_target_gravity_g = 0.25
+
+solar_wing_count = 4
+solar_active_panel_length = 20500 mm
+solar_deployed_span = 58000 mm
+solar_radial_reach = solar_deployed_span / 2 - spine_truss_radius
+solar_boom_length = solar_radial_reach - solar_active_panel_length
+solar_wing_width_x = 4200 mm
+solar_hinge_station = 9000 mm
+solar_panel_thickness = 90 mm
+
+radiator_count = 6
+radiator_length_x = 9000 mm
+radiator_width = 2800 mm
+radiator_thickness = 90 mm
+radiator_radial_offset = 5200 mm
+radiator_deploy_angle = 70 deg
+
+propulsion_pod_count = 6
+thrusters_per_pod = 2
+propulsion_pod_radius = 480 mm
+propulsion_pod_length = 5200 mm
+propulsion_pod_radial_offset = 3000 mm
+propulsion_frame_station = -16000 mm
+thruster_cant_angle = 3 deg
+plume_half_angle = 15 deg
+plume_keepout_length = 12000 mm
+
+skimmer_length = 8000 mm
+skimmer_width = 5500 mm
+skimmer_height = 2100 mm
+skimmer_dock_station = 21000 mm
+
+module_pitch = 2500 mm
+
+# Stable vehicle stations along +X
+sta_00 = -21000 mm
+sta_10 = -16000 mm
+sta_20 = -8000 mm
+sta_30 = -2500 mm
+sta_40 = 2500 mm
+sta_50 = 9000 mm
+sta_60 = 15000 mm
+sta_70 = 21000 mm

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/nx_model_audit_checklist.md

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+# NX Master-Skeleton Audit Checklist
+
+## Identity and units
+
+- [ ] Part name is `AST-0001-MASTER-SKELETON.prt`.
+- [ ] Modelling units are millimetres.
+- [ ] +X forward, +Y starboard, +Z up.
+- [ ] Project version attribute equals 0.2.
+
+## Parameters
+
+- [ ] All required named expressions exist.
+- [ ] Derived values remain formula-driven.
+- [ ] No duplicate expressions with different units.
+- [ ] A 5% ring-diameter change updates both rings and all sector geometry.
+
+## Datums and geometry
+
+- [ ] All eight station planes exist and are named correctly.
+- [ ] Ring centres remain at STA_30 and STA_40.
+- [ ] Solar wing tips produce a nominal 58 m deployed span.
+- [ ] Propulsion pod axes form an equal six-position pattern.
+- [ ] Skimmer docking interface is located at STA_70.
+
+## Associativity
+
+- [ ] Detailed parts consume skeleton geometry through WAVE links.
+- [ ] No detailed part drives the master skeleton.
+- [ ] Imported neutral geometry is reference-only.
+- [ ] Broken or out-of-date links are zero.
+
+## Clearance and release
+
+- [ ] Deployed arrays do not intersect ring envelopes.
+- [ ] Nominal thruster plume cones do not intersect solar or radiator envelopes.
+- [ ] Hard-interference count is zero for envelope assembly.
+- [ ] Stowed and deployed arrangements regenerate without errors.
+- [ ] Neutral export, screenshots and audit record are committed.

downloads/asterion-fcta-v1.0-public-release/asterion-fcta-v1.0/cad/nx_master_model/v0_2/station_table.csv

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+station_id,x_mm,purpose,nx_datum_name
+STA_00,-21000,Aft structural limit / thruster exit reference,DP_STA_00
+STA_10,-16000,Propulsion pod frame,DP_STA_10
+STA_20,-8000,Aft service and logistics module,DP_STA_20
+STA_30,-2500,Habitation ring A centre plane,DP_STA_30
+STA_40,2500,Habitation ring B centre plane,DP_STA_40
+STA_50,9000,Power and radiator service plane,DP_STA_50
+STA_60,15000,Forward command and docking module,DP_STA_60
+STA_70,21000,Skimmer docking plane / forward structural limit,DP_STA_70