Good call Buzz, it was right there under our nose, BENNET! They also worked closely with ARNTZ and EXCALIBUR! They have been around since the 70's, somehow they slipped under my radar. I see they also built some cars with the fuel cap on the side. Obviously the Bennets can vary in detail from one car to another. Seems little doubt they basically use the Arntz/Butler body design. Or, would it be more correct to say Arntz borrowed from Bennet???
E-bay ad notes it was built with the 'help' of Bennet, probably purchased as a kit and homebuilt.
Heres a pic of a Bennet from the 80's.