according to my source,it was the Strother MacMinn Redesign.MacMinn also reduced the height and might have increased the rear overhang(it,s hard to be sure,given the perspectives he used in the renderings).I think his redesign is much more successful than Gurr,s.That,s because it retains a VW feeling or spirit.It also has a more timeless appearance than Gurr,s 1955-based design.