Habitat
From OCE Space Simulation
The Habitat is the structure that houses the astronauts during their mission.
The old habitat was a small canvas affair. [stub...this is the limit of my knowledge]
After building a large wooden Habitat in the OCESS space at 440 Albert, the Board deemed it a fire hazard, forcing the then-current members to rebuild it out of drywall three months before the mission.
The current habitat is that same drywall habitat with some additions.
There are five rooms in the Habitat: the Interlock, Longhouse, Bathroom, Hotlab, and Interconnect.