Thanks for that.
So just buy two of whatever ball diffs takes your fancy and slot them in.
I bought some carbon rod to make a prop as it cost about half the price of an old one of Ebay (if you could find one) so I'll see how that goes. Also some carbon tube to make some gear shafts.
Shame about the body sets, I thought they might offer them again seeing as how they had released the car, (all be it ready built) as they're not the strongest of things and they're bound to get shunted and broken if used. I had heard they were available but no-one can get them