CursedPh4nt0m
Ah ok, so weaponry on contact joints, so far I haven't seen anyone with the idea of swiveling it freely, most people just go for hinged parts to focus on a specific point, my advise is that, if you want it to rotate freely, make it with the least ammount of friction in the interface of the hinged part and the solid part on the ship,or be it, really round.
(In my opinion your design idea, although cool, is ultimately useless, asthe same thing can be done with just moving the ship itself around, I'd explore duke's "Spinner forts" if you want some cool ideas with the same concept, I can send you some examples :p)