If the looks of the ships annoy you, you would not have liked the game at all. It is lightyears away from any realistic logical approach, it follows the fun/balance > realism line. So nothing in this game is made around theoretical possible space warfare. It is esentially Star Wars.
Let's face it, the only realistic spaceship in Star Wars is the Deathstar
@OP: I don't know any "practical military spaceship design" because they don't exist. This is a fantasy game, it can be pretty or ugly or whatever you call it, but expecting it to be realistic is the last thing I do