I'm sure that there may be several cars running around out there that have had that done. I knew of a guy when I was in H.S. that wrecked his Monte Carlo. He got a doner car, and cut them both in 1/2, and made 1 good car out of the two. He did use the front 1/2 of his original car, so the VIN would not have been an issue. There are also many cars out there that have had every part on them replaced with the exception of the cowl area, so to me that is pretty much the same thing only you replaced the car around the VIN tag.