I like Coax turret but at late game it is hard to fit them in a 15 slot ship. I would see this weapon for small vessel better like the Ion frigate from homeworld for excample.
I would see an option to build in weapon factory a option to switch a weapon to coax by remove the servos to 0 or the weapon could get the coax option by added more parts that incrase the damage.
And a better aim spot to see it easier on the display.