ImTired Mmm, that depends on your strategy
I personally like to use the "capital ship weaponry" mod, a reactor, an ammunition factory, a beds of 6 and a 2 and you have a powerful weapon with more reach than a missile, if you plan to use that strategy it is important that ship has a powerful reverse to keep at a safe distance.
In addition your designs are very mmm .... soft, need "bones", hard pieces that prevent your ship from being hit by a shot