Hey Mike, long time no see. Hope life in Flroida is good for ya.
Do a search on here in the plymouth stock cars thread by user BHA43. He has recently purchased a complete, unassembled kit car and has posted a number of pictures. He does have the blueprints, but they are in such poor shape they are not able to be reproduced.
You can also find more info on his purchese over on
http://www.aspenandvolare.com Same user name over there. He has enough photos that you can get a decent idea of what these cages looked like.
One idea I had recently is that with the proliferation of reproduction E body sheetmetal, you could reproduce a copy of the Kit Car for around $3000 worth of repop parts, plus a mild steel cage kit from Speedway Motors and a few used parts you can find on here. User brads70 even documented a C body spindle/rotor conversion that is right in line of the spirit of the kit car. This thread is pinned over on
http://cuda-challenger.com .
Tony