Had to do some searching based on the vague "history" of the ebay car, but came up with a car that used a custom cobra body with a cut down early to mid 80's 4dr Chevy Cavalier chassis (my feeble mind remembers an article in either Car & Driver or Road and Track about this mid America car dealer turned manufacturer)
Dash is the give-a-way as are the rear side markers and cut down door from the Cavalier. Again, not something that will be worth what they believe it to be as a "rare factory prototype". There is a reason why this never made it past the early development stages, I'll leave it at that.
Bill S.