Liberty and Dragon Cruiser are designed as BS and Station Killers with their forward guns. They have a few turrets as anti fighter defense. They are not supposed to deal with Gunboats. Thats why they need fighter or gunboat escort.
The bretonian destroyer is a part for itself. It is underpowered. I will suggest to give the bretonian destroyer the ability to mount 2 BS turrets to compensate the extreme lack of firepower.
Also we have really 6 classes of capships.
1. Corvettes/Sloops = Ships of Gunboat size without forward gun.
2. Gunboats = Their mark is the forward gun.
3. Destroyer
4. Cruiser
5. Battlecruiser
6. Battleships, including Dreadnoughts and Carrier
Imho they should be treated this way.
Btw, there are only three hardpoint types for the use of revoluting equipment. HpWeapon, HpTurret and HpTorpedo.
In the shiparch.ini the mountable weapon/turret classes are stated.