I found that the middle building should have been more like gravelpit B. Solid walls with large windows you can crouch jump out of. Perhaps an accessable rooftop, but that's not all that important. I also felt there should have been more room in the middle. It's an ok size, but doesn't leave much to the imagination of combat.
The CP in the middle was confusing, and distracted players attention from grabbing the intel. One of the things that makes ctf work in TF2 (which are not many things, unfortunately) is the ability to succeed in combat, then progress to the intel and grab it in the absence of defenders. Teams tended to stick around to capture the point in order to capture it, allowing enough time for the enemy team to spawn (and take back the CP in return). This was the general to and fro of the game, though a reasonable amount of captures were made (2-3).
The base layout design was ok, although the left flanks were somewhat corridor-y. It might not hurt to open them up into rooms. Especially the staircase area to the battlements which was incredibly cramped.
The intel room is susceptable to sentry nests, but i guess that's just the nature of ctf.
edit: Also, get rid of that glass around the buzz saw. It just looks odd, like we're supposed to break it and unlock the objective or something.