Any reason why we can't use powerplant to balance out turret types? Like a heavy battleship solaris would be far more energy intensive then a light one. Light battleship solaris already doesn't work on heavy battleships, and a light battleship will lack the powercore to use a heavy battleship solaris well.
It should be entirely possible to just have one class for capital ship weapons (for gunboats, cruisers, and battleships) if we balance things based on power requirements. A gunboat won't fire a battleship gun at all even if it can mount it. Similarly, a gunboat gun would be useless on a battleship.
Class 8,9,10 turrets would be completely different categories of weapons, rather then different gun sizes for different ship types. (Missles, guns, exc)