# NX Master Model Tree Plan

1. Part attributes and units
2. Global expressions
3. Absolute coordinate system
4. Vehicle centreline
5. Station datum planes
6. Ring rotation axes and envelope sketches
7. Spine and service-tunnel envelopes
8. Solar-array hinge axes and swept envelopes
9. Radiator hinge axes and swept envelopes
10. Propulsion-pod coordinate systems and plume cones
11. Docking envelopes
12. Skimmer body and control-surface envelopes
13. Maintenance and keep-out zones
14. Interface points and bolt-circle sketches
15. Published geometry for WAVE linking

## Modelling rule

Detailed parts must consume published geometry from the skeleton. They should not drive the master model.
