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First off, put the bsp into a zip file. I had to download a 22 mb file. Secondly, the map is missing a whole ton of textures, but I don't know if it's me or if you need to include them in the bsp with packrat or something:
Aside from that you seem to be off to a great start. The layout seems rather sprawling, but it's a bit early to judge. Nice displacement and general brush work so far. Fix those other problems and we'll take another look.