Actually if you do the research, a battery like gun has been proposed and attempts to implement did occur in ww2. I don't remember what ship it was, but there WAS an American version.
The deflection from the guns was not the thing they needed to overcome, and if I were to place a bet I would say it had to do with WEIGHT and the lightweight metal needed to have a gun like that on board.
This ship DID exist without the guns, it crashed of course.

It's not that far fetch to put guns on an aircraft and have them fire without issue. What is far fetched is to actually have the aircraft FLY.
In AH2 the meaning gang **** would take on a different definition.