Airlock End Cap

Airlock end cap fitting one 4m cell: a short corridor stub ending in a sealed door with a small porthole and orange frame; the open end terminates in the kit standard collar cross-section (3m wide, 3m tall) centered on the cell edge.

风格：low-poly, flat-shaded vertex colors, no textures, 2 materials: the shared opaque one plus a distinct surface (glass, water or chrome), which stays its own mesh through mergeAssets rather than merging into the rest; shares palette and scale with its kit