Just wondered last night...
Would it be feasible to design/build a similar layout space frame in steel tube? I picture rectangular thin wall tubing, possibly with lightening holes even.
Use the same suspension design and everything else from the BILLET car but with an affordable modern frame.
Not that I will ever be able to afford the best, a Genuine KIRKHAM, but if I were, that is what I would want to buy. I am not concerned about "originality", I want the best brakes, best handling, lightest car with the beautiful AC body. My preference would be the 289 FIA shape, but the 427 style would be more popular I am sure.
Considering how many replica builders have used different frames I believe this would be an excellent option for your cars.
Just a thought