That's it.
Mr. Will went on to a successful design career with General Motors, worked primarily in the Corvette / Camaro studios. He worked on the Aerovette show car and did the primary design work on the 25th Anniversary Corvette. Other projects included Camaros, the Vega and # 898 show cars. Will left GM to design his own 3 wheel high mileage specialty car called the Turbo Phantom (seen in this puzzle):
http://www.autopuzzles.com/forum/index.php?topic=1327.msg11817#msg11817After the Phantom project, Will went to work at Subaru from 1980 to 2006. The Subaru Outback concept and first production models were his design, and the Forester concept was also completed under his direction. He worked as liason between the US designers and the Japan design team.
Will moved to Phoenix, Arizona and started Phantom Design in '06, a small company that does design and (fittingly) scale model mock-ups of automotive designs.