Quick question - can't the main guns or at least the secondary battery of the light cruiser be used for AA purposes as well? I mean, most real life navies, and especially the Imperial Japanese Navy, had dual purpose guns that could be used for AA duties as well.
Actually it is, as you mentioned, they use main guns for AA duties like type-3 naval gun in IJN vessels. It didn't hit well in the history but firing against air plane with maingun sounds very adventurous、i like it
Yes, those are exactly the guns I had in mind. Of course, seeing that they had their charge in a separate bag and the fact they needed to turn the whole turret around to point it their accuracy as well as their firing rate were low, but I bet none of the ships/aircraft in your world are as manoeuvrable and fast as real life ww2 aircraft were. Besides, they look much bigger so they should be easier to hit.