Wow, great looking stuff man. I love the textures.

You definitely know how to portray architecture realistically, that ditch with the bridge between the two doors looks great. Very nice texture work overall (although I can see a few alignment fix-ups that need doing), and I like the way you used displacements on the walls in the 4th screenshot, the way the little passages in the wall are created look really realistic. Anyway I hope you get around to releasing this map, it has brilliant potential from what I can see.