Hi you would have to get a donor car or loads of parts most of which will probably need reconditioning, then there's the problem of mounting points as well as getting the transfer box aligned properly, cost wise it would be more cost efficient to buy a later Audi which is already a Quattro. Prime example my attempt to turn my MK1 Escort 1100 into a Mexico cost me two girlfriends and cash wise a good deposit on a house.
Steve.
Steve.