Such strong lighting colors are always a no-no, especially when you have white light sources on the ceiling...
Impressive! The whole idea is ingenious and well made. I have only couple suggenstions remove all hl2 props, they don't fit in tf2 world. Secondly those "holes" in that building in the first picture don't look very real or nice. I'd just remove them.
Edit: Can't download mapfile... Anyone else has this problem?
The reason you don't want colored lights isn't for good looks, it's a gameplay issue. It makes the colors harder to identify and TF2 strongly relies on color theory. Plus green lights make people nauseous.