There was somebody in the US selling Z8 orebodies for the Z3. I tried many times to contact them but never got an answer which was strange as the kit was being advertised on eBay which would have cost them money. The details I had were
Jackie at CarKitInc
10745 U.S. Highway 431
maybe one of our American cousins could shed some light on it.
Then could of course dismantle some ugly duckling Z3's and produce the swan like Z.