Hmm... If the Space Ghost has Superman powers of this sort, it's sort of natural to assume he also grew the Cruiser the way Kal-El can grow things out of crystals - as a somewhat crude extension of himself and his powers, inferior to the character himself in many respects. That is, unlike the technologies of Batman, which are superior to the physique of the character himself and elevate his powers to new levels. The Ghost might not grow a particularly "physical" Cruiser for himself, then, just something that he likes to "wear" when going to work.
This doesn't bode well for the modeling project, though, so it's probably best not dwelt upon too much.