Think about it; it's a rotary cannon with large aoe, cybran have aa which can toggle direct fire. How hard would it be to mod? I don't know if SC can find a firing solution with the first leg of a high ballistic parabola, so maybe give the AA gun no arc like other AA and simply halve its max radius. Edit: and make it explode at target altitude.
That would be much different from a Fatboy or Mavor.
Overpowered? Not at twice the mass of an air experimental (which it still couldn't quite destroy before taking damage)