Thanks for the great feedback fellas. This was actually my third map I ever created, it involved a lot of going back and "cleaning up" my sloppy brushwork.
@Condus: I'm aware of the utter silence issue, I am still working on that. As far as the texturing issue for the main core, good idea. I hadn't thought that much about it. As for the outside tunnel areas, they are not quite finished. and OOPS @ the elevator. heh
Finally, in closing, you are correct. This is my first ever released map. I hope to turn out something equally good for the source engine soon