I'm not too hot about these ramps. If the access to the pipe is going to be easy, why not just have stairs in the first place? This seems to be complicating it without reason. As for the rest of the intel yard, looking forward to seeing the pipe without a fence, it would benefit it a lot.
Just fill this up and block it off. It seems a weird spot to be able to hide.
This entrance is rather hard to see, might want to put a light directly behind it.
A scout only JUST can't make the jump from the concrete to the top of the roof. This is rather frustrating if you're trying to get around quickly. Consider slightly lowering the roof or moving the concrete a few centimeters forward.
The boxes in that same screenshot - I must say I'd like it better when any class can get on that roof. That way, going to grab the half-health kit is a genuine disadvantage and danger, plus it would cater the soldier-demoman-scout setup a little less (contrary to popular belief, competitive players actually like to have some variation!).