Whilst cleaning up, I found a sales catalog (dated 1990/8) from a company named Shoda Iron Works (Japan, of course), which I had some association with in the past. I have posted a couple of scans from that catalog at; NSX Prime Member Photo Galleries (NSX RELATED PHOTOS ONLY!). I suspect that this would have been the first "pre-production" NSX. Does anyone know anymore about the prototyping?