the right choice of rear axles

By the way...

What do you have available in your area in regards to wrecking yards or "cheap" used cars?

You might be able to find something from other manufacturers that you could adapt. Jaguar independent rear?
with anti-pollution laws, dealers in used parts become rare.
the idea of an independent suspension from jaguar is interesting, but I want to keep an original look.
I will try to find a Ford 9 '' rear axle