I have worked at both a refinery and on marine vessels. The equipment and look of the environment is not that much different. I would say a major missing component in the scenes in the movie are bulkheads. If they drew in some bulkheads in the engine room with some overhead structural ribbing to make it feel tighter, I think that would have made a big difference. The scale of the interiors of the engine rooms does not feal right with the size of the vessels. I like the idea though, that the saucer is more hotel-like, and the secondary hull (engineering hull) is very industrial. This is realistic, I think.