What sort of ship?
A mining ship would be different to a cruise ship, which would be different to a strike ship.
Bunks vs hotel style rooms, wide spacey corridors vs space/cost saving rat runs.
Just a bridge, simple cabins and an engine room vs a dozens of floors of cabins from cheap to VIP.
I would get a purpose in mind first and then work out what actual rooms are needed.
Does the engine room need to be away from crew – is it noisy, dangerous, likely to leak radiation?
How long are these ships out there for, do they have a galley, do the crew eat in their bunks, is it an exploration vessel with its own hydroponics and gardens?
and so on…
Once you have that then you can choose what part of it you are to model and start from there, at least you will know which bits not to include..
