Of course I understand that this isn't a warship, but it's the general style I'm trying to replicate.
Warship or not, it actually depends on what modules you place in it. For years I thought the shape's influence over turning rates is crucial. Well, believe me, it exists, but it is way smaller than expected and it's actual influence over the combat is even smaller.
But to make the shape beautiful instead of practical, then add more weight than the hull just in external decorations, then use half of internal volume for RP, all of these together are what can guarantee a ship is not survivable. If you just deviate a little from the absolute optimal, it will definitely not influence the ship's combat ability.
Really, if you have the time, make an experiment: After you build a cool ship, make a cube with the same frontal armor, same side armor and only the useful modules of the cool ship. Same reactor, same tpm ratio, same number of weapon modules and support, same shield sistem, no empty or RP space. If the resulting cube is half the cool ship's mass and perform obviously better in combat than the cool ship, then it means you did it wrong. If the cube is 80% or more of the cool ship's mass and handles almost the same, never doubt your warship building style again.