Gunboats have too little hull i guess, 2 novas take about half of it away....
but the weapons are fine, any stronger and they would be able to take cruisers like before.
Battleship weapons need to cost more (not the basic ones, or the primary/secondary ones though) to force people to stick to either a cheapy loadout or spend tons of cash on upgrading...
Battleships being so much stronger would make fighters redundant again, and there would definately need to be a rule about their usage.... But if a rule comes of it, then im all for making them stronger.