So 6 main battery turrents should be the max period, the reason being historical fact, it was difficult to place even 6 main battery turrents as you had to now store shells and powder next to steam lines ect, and it also limited the power plant of a ship. I like that you've given us the option to go ham, but I think anything over 4 should decrease range or accuracy because your powder is now stored in an enviroment much warmer than ideal, and over 6 should just be a no, that includes wing turrets, just say no to more than 6. I'd say 4 is max without penality, this is why the American's when they did the standard classes settled on 4, because the New York class and all precedding classes with 5/6 turrents had issues with powder degrading quicker thanks to storage conditions. Just a thought