The sketch is by Jose Vicente Martins. Here are the names of the people involved with the Project X/SP2. Rudolf Leiding-project leader, Senor Schiemann-design team leader, Jose Vicente Martins-designer,Jorge Oba-designer,Marcio Piancastelli-designer. You expecting me to say Luigi Segre from Carrozzeria Ghia??? As, I understand it...Jose Vicente Martins..studied under luigi Segre in 1962. I sure hope this is good enough to solve this puzzle. I cant go back in time and trace every single detail.