John,
I am really looking forward to seeing how this project progresses as well ... it will be very cool whichever way you go in terms of chassis and suspension.
As far as simple frame vs C6 space frame, if the car will have more of an old school look, then go with the simple frame ... if it's a more modern interpretation of what the Kellison would have evolved into, then the C6 space frame.
Just my .02
That being said ... Having seen photos of some of your past projects, I am sure either way will result in one unique and awesome car !
- Tim