Dave, I understand that by the late 70's only the quarter panels and roof were used from an actual production car. At least part of the cars were actual production cars. The rest of the measurements and fiber glass body panels still represented an actual car. This is what I was referring to. Now a days, as Hakan said, the bodies are far away from production cars and don't resemble an actual car at all. In that video I posted they still looked like cars and had some lineage to an actual car unlike today.