take a good look at it, and think about this logically. The apollo cockpit, the valkyrie cockpit, hell any cockpit. Roughly the same size? I would think so, if that is the case then the model is fine even at half the length of another fighter. whereas most fighters are not as tall as they are long, this one is. it's shape would lend itself to a shorter fighter (lengthwise). yeah it's small, in length, but it makes up for it in height. if anything i would say only add two meters to the length, the overall shape as oposed to the flatness of the ulysses, would lend itself to having a comparable amount of interior space, space for fun things like weapons and engines.
once again though, this is just my opinion, and not a fact of physics used in the game.