Looks very doom-ish, but nicer. Not many Cube maps actually look like something - most are just "generic castle-ish thing" - yours has an actual sense of being a real building.

It's not a big one, but it can affect gameplay. I didn't intend for it to be possible to reach the quad by just rocket-jumping into the vent. On the plus side, it is still easier to use the jumppad, as it uses no life. Also, I suppose that this will discourage campers from just picking off people falling down the vertical shaft.

"ONE SHOT, ONE KILL"
-Official Motto, U.S. Army Sniper Reg.

I really like those machine part details. Very nice. But I think the map is overall far to large (wqd 15 000 in places).
It would have benefited from being smaller overall, and therefore more detailed. Also the item placement looked a bit uneven to me (some rooms only holding one ammo-pack, while others quite stuffed with em.)
Also pretty hard to navigate those small stairs and corridors.
If you get ugly z-fighting effects with the skybox, that´s a sign you´re building too huge..