Sorry you haven't had any luck yet Silver Bear.
Ya know, it might be just as cheap and be more benneficial if you found a rolling frame and body that you could put your engine into.
I know it's pretty easy to find 230 Quadsport chassis at salvage yards. The trick would be to find one that hasn't already been too stripped to use as a donor.

I know of no one else specializing in what you need

KNOWSALOT