Erador
Just remark to your inspiration of naval WWII ships
= Ships will need much stronger hulls. Because 1-2 layers of armour will easily penetrated with a large cannon's bullet.
It is true, that armor of ships cannot withstand main weapons fire, but difference between Cosmoteer and WWII ships is fact that WWII ships had usually to fire lot of sheels to manage at least one hit, exactly teory number of US Navy states: at 30 000 feets had standart 16 inch USnnavy gun accuracy 2,7%. on the same sized ship which show its broad size, end top accuracy is 1,4%.