Looks fairly nice (if a bit overdetailed for an alpha). A few problems though: I had a bit of trouble finding my way around at first, and got a bit lost; I think a bit of added signage would be nice. I also noticed that there wasn't any patches underneath any of the pickups. Also a bit of a visual glitch
here, but only on Red's side. Also, with that much detailing, it's probably a good idea to build cubemaps.