ok so you have a car that is worth some money due to rarity or demand but has a knackered body... would you rather see it wrecked out and never grace the roads again OR given a new body from a vanilla variety vehicle? I know id rather see that car remain on the road with a new lease on life providing it was declared at the time of sale. it might not be the right thing to do if you are on your moral high horse but economically and realistically it is the best option. consider this... would you rather buy a sandman that comprises countless rust repair sections and a firewall and roof etc from another car (ie just a repaired rust bucket) or a sandman (both in id tags and appearance) but with a great body from a n/a commercial that has been in a old mans garage or out on a dry farm its entire life? if you are playing for keeps then I would take the rebody option as i wouldnt be worried about chasing rust every time it got wet