Jackson made a V Bass very similar to the Randy Rhoads guitar. They occasionally pop-up on ebay form time to time.
I have one epiphone v-bass pop up one ebay. I dont know if it was a custom job or a rebuilt thing, or if epiphone made them.
The Dean Flying V was very, very heavy, had a HUGE neck, very, very high action, sounded like dookie.
I wish Dean would make a high-end model.
There is a company on ebay called "Davis" that sells a V-Bass. Really cheap. I have yet to see anyone comment on the quaility.
Good luck on the gibson v-bass.

Wasnt there less than 500 of those made or something?
Your best bet would probably be a jackson, if you want a 4-string.
I want to say that Warmoth used to make V-bass bodies. They sell the necks still.
I was trying to see if the Gibson Flying V and the V_bass were the same body. I think Warmoth does sell V-Guitar bodies. I suppose if the neck fits and you orderded it un-routed for guitar pick-ups....
hmmm....