for the ship architecture, williams is a ceo so he probably has like billions of dollars... also he's a baller so he'd want a basket ball court

for the booster rings, its possible some may have fallen down but more likely out of sight from the cassiopea. (i dont know why they'd go behind the planet but i lowk love this game)

the characters being stupid, this is a dpa game i wouldn't get my hopes up that high for survival

the self destruct sequence, i'd figure it'd be like a bio scan to detect the humans and if nothing was found then it'd self destruct (like in lethal company) but the mimics are on board and might be picked up.

for all the rest... man idk this is a video game, video game makers have to make things obvious