[Aussie Mike]

This is something I've often thought about too Andrew.

I reckon a traditional style round tube chassis would be straightforward to build. use 4" tubes like the 427 but maybe space them on wider centers to help with the torsion and beaming.

There is a big selection of diff centers axle and suspension uprights available from various donor cars. Holden, Commodore etc would be easy enough to adapt. Suspension arms are fairly straightforward to fabricate.

You have a CR that handles pretty well after some mods and tuning. You could use that geometry as a starting point. Then there are several good books available that show you how the geometry works and you can set up your roll centers etc to suit yourself.

Cheers