Indeed, the differences are thin... I would take it's mainly a false perspective distortion because of the cam FOV (ie wide angle lenses, for those who are photographers). Easy to correct
Now the other thing that people seems not to pick... It seems far bigger BECAUSE there is a hell lot less details than in a real interior. Small details like a valve or pipe, but since the real interior is litterally full of a hell lots of them everywhere, it takes a lot of room! Without 90% of them, it is sure to look like a lot more spacious!
Once we find out how to implement 3d models into the game, then again, it's perfectly modable with a lot of time and research material.
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