As mentioned in the Early Designs thread, clay models were an important part of the initial designs.
Here are two more clay models. Neither one made it into actual production.
Picture 1 is a from 1965, a Camaro Nomad.
Picture 2 is from July 14, 1966 - on the left is a Camaro 2 Seater. Clay models could only stay outside a short time in the Detroit summer heat. Notice the regular Camaro, possibly a pilot car, in the right side of the image.
Photos and information - credit to GM.
Two more photos of XP-836 in clay early design. Note the Panther emblem on the fender and the letters P A N T H E R on the tail panel.
Photos and information - credit to GM.
'clay model' terminology is accurate; concept cars they were not... :)
The Camaro 'Nomad' clay is wild! Too bad it did not make production.
As for the two seat version, its proportions are off, and glad it did not make production.
Here's some more clay pics, apparently farther along the design process.
They cover the clay with mylar to replicate the paint and glass finish, btw.
Panther prototype pictures. Kudos to Lee Stewart for the pics.
Design is pretty fixed at this point. Oct 65 pictures.