De Marco, trading as DeMarco's Ltd., was based in Belleville, New Jersey, and built the Roadster by De Marco, an open two-seat version of the Corvette. The cars were hand manufactured by skilled craftsmen under the supervision of the designer, Richard DeMarco, using General Motors parts and all the factory convertible braces and alignment parts. The Roadster was offered in two forms: a hand-built ground-up car, which the company said…