I've posted this to the google group but I'm also posting it here. Discussion in the google group at:
http://groups.google.com/group/gwj-tf2-altf4/browse_thread/thread/ca0bab0d11715770

I'll try to summarize it here:

One defense we have to defend B. 2 engies, a demo, and a pyro should set up there. An engie and the rest should set up on A.

E is a diversion and should be treated as such.

There should always be someone supporting the engineer.

Our primary sentry at C is at the bottom of the B-C wall.

Don't leave D to defend by a lone engineer.

On offense we have to keep them from setting up at B.

There is much, much more in the google group.