just wondering ?

[snapper]

Another problem to be aware off is the wishbone bush bolts going through aluminium brackets, or steel tube and aluminium together causing different metal electrolysis.
The Robin Hood lightweight was an ally monocoque designed as a one season race car, it needed a Hugh amount of re-engineering just to be strong enough to pass IVA.
A well designed steel chassis built with the lightest bits can be around 400Kg