Found it! web site dedicated to fiberglass cars of the past lists this as the "Sabyan Special" spotted in a garage on Long Island, NY in the 70's.
May or may not be fiberglass could be a metal custom, current location unknown.
Still trying to identify the film this vehicle is supposed to have been shown in.
Let me just say, this has been a real challenge and joy to research, as well as, interacting with Carnut.
Great fun.