The project got expanded to include other theatres so I delayed it. We'll have some news on it soon when I have my post-Summer meeting with the rules guy.
I don't know about AA guns, what are you thinking?
Breakthrough - defender sets up all units. These units can be anywhere you want. They must NOT be in the attacker's third of the table, eg if your gaming area.
They must also be spread out. On a 6x4 we say 18" apart. This represents some lack of preparedness. It will kind of look like a chequerboard formation, so you'll have a lot of depth to the defender's deployment.