Starting from the front of the ship at the left end of this picture, the modules are:
- Command Module (ComMod, sometimes called the "Commode" by the crew- possibly a naval reference to the "head" of the ship): Blue with yellow windows. This has two loading ramps, 3 cockpit hatches, and a back door that leads into the main hall.
- The central body section: Mostly yellow with a black section at the fore end of the main hall.
- Two Operations modules (OpMod1 and OpMod2): Blue with yellow windows. These each have a large hatch door on the top and an opening to the interior of the ship.
- The Cargo/Lab Module (C-Mod or L-Mod): Black with large yellow windows on the sides and rear. When the ship is assembled, the rear window is mostly obscured by the Primary Engine Module. This section has two large doors on the top and an entry to the main hall.
- The Primary Engine Module (PEM): Blue with grey details and 3 large engines.
- The Secondary Engine Module (SEM): Blue with 2 dishes and 2 thrusters, sitting below the PEM.
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