Good ideas Flame. I'm thinking that some sort of hoodoo/thing on the CP would be nice, and could replace the half-wall I have there now.
At the moment that wall is there to allow cappers to have cover from the ramp area, thus giving a reason to attack from the balcony. Really though it could be done away with if I came up with a clever enough design.
Explain why the change to the upper level house should be made? Right now it's mostly for sight lines.
I'm hesitant to narrow that choke but I can see where it being so wide is a problem for teams trying to hold the yard.

I guess I can try it, I'll show you it when it's done.
The half wall in the yard is meant to break up the extremely long sight line from the ramp to the mouth of the tunnel. It also adds the possibility of a sentry in that corner of yard and adds an interesting scout jump, you're right. Are you saying it's bad?
As for adding a way for medics to pass (or every class, that is) I don't see why not. It would improve the flow by allowing people to more easily hold the walkway from the right side (attacking from mid). The walkway is intended to be the most important feature of yard but right now it's underused to the max.
I'm also hesitant to narrow the tunnels because even as they are now teams can get bottle-necked very easily by pyros, heavies, even spies. I like having that area with enough room for a side-to-side battle but not enough to encourage camping, making it more of a safe through-way.
>:3