Alright now things are starting to shape up, nice improvements =) As for the grime, now that you're doing it in tiles it does get a lot trickier, but not impossible. Its a good idea to leave leave the grime that will be repeated often out of the diffuse. Instead do a few grime/slime trails on a strip a lot like the stairs…
lol duh, yes, 4 textures is much better. I still believe you could work with a modular style of texturing though, I bet you could get this down to 2 1024 textures. Looks great though, cheers!
Wasnt trying to berate him, just giving my honest initial opinion. Sometimes that can be a bit harsh i guess. Anyway, I wrote up a bit about uvs and texturing and some theory stuff for my failed modular contest entry, there may be some useful bits in it here; http://boards.polycount.net/showthread.php?t=54178
7 1024s is just overkill in my opinion. You should reconsider using so many maps and try to go back over your UV's and bust it down to a couple 2048s or something like that. Tilieable textures would save you a ton of memory and show potential employers (if this is a portfolio piece) that you understand how to get the most…