what is wrong with the idea, it dosn't seem deserved of the realm of 'pipe dreams'.
i personally don't see where the big issue is, if he has a few clues and some 'kiwi-cleverness' or No.8 wire technology, then there is no reason why it can't be done at a reasonable cost, just to say that it has been done. everyone told me it is way cheaper to buy a built race/rally car than to build one, essentially i re-shelled (with the first cage i've ever done), my old rusty KE70 for the cost of the safety gear and was far cheaper than a 3/4 rooted old rally car i could have bought if i wasn't such a tenacious c@#t. i had the buld in theory, and adapted my practical skills to suit.
go for gold, i reckon, but have a look at some of the other vehicles that have been done in a similar fashion to get your head around was needs to be done( if you don't know already.