Nice. It's been a while since somebody has made an elaborate DM map. My suggestions:
- Use a different ceiling texture. The patio brick doesn't work up there.
- On the section with all the ramps, the side of the ramp needs a different texture.
- I see you used the mist brush trick to make barrel sides with no thickness
Unfortunately you can shoot through them...
- For whatever reason, the barrels seem excessively large in this map. Probably because it isn't as open as most. This might be a good time to push more realistic proportions. Real barrels/drums are about half that size (round up to about 32 units tall -- you'd have to crouch behind one for cover).
- Barrel textures are missing.
- The metal bridge is really thick -- tread metal is really thin, typically. It would look a lot better to have it like 1 unit think with some metal support beams running under it or something.
- Several impossible structures -- like the ceiling above the metal bridge -- there's nothing holding those center details up. The edges just touch.
- Barrel textures are missing. I'm kind of curious why you didn't just use the standard barrel textures.
- Equipment seems kind of sparse for the size of the map, but that might be good to promote pgp battles and conservative play.
- Use lowercase filenames for textures. Linux is case sensitive.