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There will have to be EVA handrails on the outside of the Reference Mission spacecraft, to aid the crew in moving about the spacecraft stack when assembling the stack or on other EVAs.
The handrails are used on other vehicles like the space shuttle cargo bay, and on the space station Mir. The handrails are yellow, and held up by stanchions about 2.5" (6 cm) high, or just high engouh to fit a suited hand under.
The SPACEHAB modules have a flat surface, on one side, for shuttle payload integration requirements.
The EVA handrails will be along the edges of the flat wall of the pressure vessel.
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