All of the metal in those screens looks wrong. The outside (white) roof would probably be overhanging the rest of the building by 8u or so. You're also using very odd sizes: for example, the metal that makes up the window is way too thick. You could easily get away by making every strut the size of the smaller horizontal ones; and make the glass uniform.
Concrete isn't used for making trusses like you have going on - that's usually just smaller metal beams. Furthermore, the two big columns you have at the corners are very weird. They're big, yet they only seem to support one side of the roof (they aren't flush with both sides of the corner). I'd suggest making them L-shaped and aligning them with both sides of the building.
EDIT: this is aimed at Crash, lol, not at fubar.