@piscolar:
Good thoughts Barney, thanks for sharing. Never played NWO (actually just looked it up now). I considered something similar in my initial brainstorming but I really want to involve the tactical element: thinking of Fortifications like bases for ground units, rather than ground units themselves.
One old idea to make AAA unit more interesting was this little tweak, which can represents fortified hardpoints, is to make it a 2 hits unit:
Anti-Aircraft Artillery
Attack 0
Defense 0, 1 @1 preemptive, up to three planes, 1 per plane max.
NCM 1
Hits 2, auto-repaired after combat
Cost 5
In addition, if no combat unit is with it, then it is auto-destroy, per OOB rule.
For 15 IPCs, you get 3 regular hits, 3 buffer hits, and up to 9 preemptive strike @1 on aircraft.
With Infantry, it is 5 hits and 10 defense points, but you loose 3 units on first casualties.
An additional ability to figure Atlantic Wall and Siegfried Line can be that when attacked, you may roll 1 defense @1 of preemptive fire on ground unit attacking per AAA unit.
Another possibility can be this:
Anti-Aircraft Artillery as Fortifications
Attack 0
Defense 1, up to three preemptive roll @1, against up to three units, ground or plane, 1 per attacking unit max.
NCM 1
Hits 2, auto-repaired after combat
Cost 5
The one time preemptive roll can simulate the fact that once fortifications are overwhelmed, they can no more use their defensive weapons.