I'm making my S:AAB ships as big as the canon measurements... but they all seem far to small. I'm seriously considering embigenning them all by, say, 50%, perhaps more for the big ships.
With Volition's fighters and bombers, the cockpits are out of proportion - look a twenty meter long fighter, and its cockpit is far bigger than any one human would need. This is an accepted part of V's models. Like I said, V went for looks over realism

As for the huge bombers thing, it's the same as making these enormous juggernauts - it justs get silly after a while. I mean don't get me wrong, I'm not saying the GTVA would never build a bomber the size of a Fenris, but it seems to me that when people set out to build a bomber they often think that the size of the thing is the overriding factor...