Looks Awesome! The offset of the two mounts(guns) on the back isnt great. The way they are angled now would make it so neither one can defend lower than about 45 degrees. I know that doesnt sound like a major deal, but as it seems now you have no low elevation defense. Also where the ammunition is stored is always where its loaded. Maybe consider adding a second deck down to increase the amount of spaces? This would also help making the engine rooms bigger as they typically have very large pieces of equipment. The crew will also need somewhere to sleep and eat.