Most of those parts aren't old chassis, the markings show they are the original templates used to cut and drill the chassis parts.
I'm in the same position, I have front and rear end parts somewhere but spares never come up for sale anywhere. If I ever get around to digging them out the easy bit was going to be drawing up and cutting my own chassis for it, at least I now know where I can get a template to copy now.
The early cars were very flexible, carpet wasn't universally used we were still experimenting with tyres and additives in the early years. As grip became easier to generate Nick developed the car over time. You will notice all the updates made the car stiffer and stiffer with less holes in the chassis and the bugger top plates, and he went to twin rear shocks to get some roll damping. The team was constantly developing the cars, there was a time when I don't think it stayed the same between each national.
I wonder what happened to Nicks old stuff, I'm sure there's loads of us who would have loved to go through all the parts and cars.
