I've just about got my 1981 Mini I bought in highschool for $600 NZD back in one piece. Wasn't going to touch the engine originally but thought why not, so almost 20 years later with almost everything aside from the shell refurbed or replaced here we are. It's been expensive and slow and I'd have been better off now having put the money into a house deposit instead. But now I know a fair amount about rebuilding a 45 year old car and I have about 10k in specialty tools I will probably barely use again, so I guess there's that.