Nice pics.
Good to see GM giving access to some of these pics.
Here is a pic I saved to the PC back in 2003, so not sure now where I found it.
It would seem to be a different pic of the same model, with only slight differences.
And a few more which unfortunately i only have the thumbnails for these.
I can recall that Holden had a display board up at Fishermans Bend during the 50th Anniversary that contained pics of prototypes.
I took a pic or 2, so I will find some time to dig 'em out to share.
Interested in prototypes, check out the 'Other Images' forum for more.
Regards
Alex