Hehehe, thanks.
What an artistic collage indeed! Well, I checked your waypoints again, and all the things I had mentioned seemed to be fixed - all except for one: the door. On the CT side, everything was fine, but the T bots could still get to the door before pushing the button, which they did. So they blocked the door, while on the outside, CTs jumped to the waypoints on the bridge railing, stopped there because they heard the Ts from the inside, and fell down in heaps until they died. :-/
So I fixed up the connections inside the castle and removed the waypoints on the bridge railing to be on the safe side. It works fine now, but bots don't need to push the button if the door is already open. That's why I tried removing the button flags, but I haven't tested that yet. I'll keep you informed.