Hey, nice update! I think all of the complaints my group had, at least as far as glitches and exploits, are gone, and there's a lot of improvements and changes. Nice work! I really like the "valley of death" near the final point. I wasn't able to build anywhere in there this time, and it looks 10 times better to boot. You can still find a couple of spots to jump down there and live, though, if that's of any concern. Nice bridge over that, too!
I found the player clip for the stairs, which I see you already knew about. And I was wondering why my stickies sometimes bounced off of that window, so I guess now I know why. I was able to get into a couple of odd spots as a demoman, high up on the sides of buildings, but there's so many normal spots where you can get height advantage that I'm not sure if it really matters, other than it's strange to have a demoman hanging off the side of the wall. The main one was actually right across the cart track from the invisible stairway near the 3rd point. You can sticky crouch jump and squeeze into a little spot on the building up there. Here's a screenie taken from that spot. I didn't think to get one from below showing where it is, but I can provide that if you like.
Also, it's probably not important, but in the first blu spawn room, you can jump up into the space between a couple of the walls and the ceiling, where there's some barrels and junk. I just thought I'd make sure you knew that. I can't see any real way this gives an advantage, so I'm thinking it could probably be left alone. Blu needs something to do while they wait for the setup time to be over, after all.
We haven't run the updated map through our servers yet, but if and when we do, I'll give our impressions as far as gameplay and whatnot.