TL;DR
Put in an object or two that'll show The Engineer lying back and relaxing when used.What?
Add something like a hammock to string between two poles or a deck chair that can be put down anywhere. If the player presses Enter next to it, The Engineer will lie back in it, relaxing and just watching their factory work. Or sleeping with their helmet over their eyes, if it's at night. Pressing Enter again, will have them standing up and walking around again.Nothing practical, just for the cosmetic fit of things.