Oh yeah, and do try to make your screenshots smaller (both in terms of filesize and resolution).

sighs and doesn't even bother counting

This still looks very big and empty. I'm sure you're planning to fill this all up with interesting stuff but maybe you should spice up the rough layout first. Adding detail later mostly can't hide the fact that the detail stands in big, empty space. I think the player would feel a bit lost and without cover at places.

It looks like a good start, albeit in it's current form it looks very very bland, especially the ceilings.