theres a hell of a lot more into just throwing a cosworth engine into a mk.2 shell.

a decent rear axle will cost you £2-£3k.

imo, it will be cheaper buying one already done.

unless you want a really decent shell and spec then it may be better for you to get one to your requirements.

good luck Jim.

have a look in my resto thread just to see a few things that you will need.