Your "unsafe at any speed" comment (Ralph Nadir, misspelling intentional) would lead one down the Chevy Corvair path, but that is a never-produced 1962 Bertone Testudo.
( A Mercedes/Corvair connection is that John Fitch, who modified Corvairs for sale the way Shelby did Mustangs - but with less fame -- was the only American who raced for Team Mercedes.)
LFrank
Washington DC
65 230 sl
DB334/Hellblau