Wait, so is the OP looking for a large space vehicle, or a large space build? I'm confused.
Anyways, idk if it really matters so i'll just post this here.......

The exterior. Yeah, beleive me, the interior is even better.

The main hall. The ship's 2 hangars, sickbay, turbolift & corridor to the engineering section can all be accessed here.

And finally the main corridor leading to the engineering section. Contains a blast door for security & environmental purposes.
Well, that's the overview of what i've got so far. I might post more pics later.
Inb4itlookslikeadumbbell