Where did your info on the V38s come from? I don't recall finding anything on them other then the fact the TIE Phantom was based on the V38.

I'm curious as well.

The "assault" designation is a challenge as there's not much analog in the real world. In star wars it seems to either apply to "attack" type craft (close air support and precision bombing) or just a cool sounding name applied to otherwise unremarkable craft. The craft presented in Rebel Assault 2 (minus the cloak) could fit either description with little adjustment.

For cool name, I'd drop the cannon count to three, the crew to one, hard points to 2, and probably be about done.

For attack I'd probably replace the cloak with a missile launcher, and might rejigger the cannons, but that would be about it.