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Toilet, do not forget about toilet Who cares about shields (maybe they will miss) or about lasers (you can always ram). But no toilet? Unimaginable Also kitchen, dining hall/mesa, laundry room, recreation room, gym, water/waste recycling (everything long range and decent sized needs it), life support room, emergency water/oxygen tanks, medical.
Star Trek uses the astrometrics lab, which i think is just a SEXY name for a starship room...even if it is just a big map. http://memory-alpha.org/wiki/Category:Starship_sections this might be useful.