I based it on the Cobra restorers blueprints available from them for $200.
http://www.parts123.com/PartFrame.as...obra_Restorers
I can tell you the suspension is the expensive part of the project as you're stuck with pretty much one supplier for the original style frame but you could make some of it. Alternatively ou could use Mustang II type aftermarket stuff instead but you'd be reengineering that side of it on your time/cost. Can you stick weld 16 Ga 3/4" tubes together? If you can I'd say go for it as stick gives good penetration. If not think about a 110V Mig to do lighter stuff. As far as a body you've had an offer already. I know another guy using a Midstates body on a Contemporary chassis. A lot of bodies will work but probably the best would be the shell only type to fit the birdcage. Again the alternative is something like a CCX or Midstates with the cockpit all moulded in and just build a flat chassis to put it on. You can click on my gallery and check us out at
http://www.actoncustom.com
There are a lot more photos and recent parts that aren't on the website so just ask any specific questions. John that sounds like a fantastic project! Put some pictures in your gallery so we can see some of your work.