Cool addon!
I'm using the first release now, and so far the hit pK is pretty low. That's fine though, the mod kicks-ass overall and I can consider the misses as heavy ECM from aerial targets, non-upgraded, late 70's manufactured rounds, and my overall suckiness.
Just an idea, it would be cool if you made the Straight Flush radar system. It'd be cool to build an entire SA-6 site to attack, radar, TELARs, reloaders and all. Or maybe the SA-11 Gadfly? Uses the same chasis, really the biggest change is the addition of an onboard radar.
Well, the SA-6 addon is great regardless, good job!