That actually gave me, I think, some ideas.
In which the OP suggestion would normally imply variety when targeting enemy ships. And it's probably been long, the only weakness would always be the Engines, and nothing more.
The implications didn't stop there though, the Hammerhead and the Gemini has the shape that suggests it has more armor at the front while its middle section is lies out in the open, the Conquest and the Falcon have weakspot bridges on the center from the front. It could have been nice by then if we can adjust the ships by armor sections and not just increase the overall armor of the ship.
But... I'll just leave these thoughts here.