...from the screenshot, it looks like another square-shaped map with some crates in the center, but when i saw the stuff that isn't on the screenshot, i was a bit positively surprised ;)
The broken parts look great !
And yes, i also think that parts of a map which you could reach easily shouldn't be clipped (roofs). Also, i'm not sure about the pickups...in one room, there are 2 cartridges next to each other, which seems kinda useless.
There are a bit many shotgun shells and riflerounds too, imo. Still better than having too many grenades though ;)
The surrounding of the map is very nice, it's just cool if you have sth to look at, other than if it's just a closed room with solid walls.
4/5, good job ! :D