Reminds me of a 63 galaxie I saw once. I went to check it out as I was in the market at the time.
The car looked nice from the pictures. Went to check it out and was surprised at the amazing skill in the redneck body work.
the rear quarters were entirely gone, almost no sheet metal. However someone took spray expanding foam and shot the whole rear of the car. They then took a razor blade and shaved it to where it was close to the original body line, then went over it with bondo and applied a (oddly enough) really high quality paintjob.
I was half and half, disgusted and amazed. It seems for the huge amount of time and energy they spent getting it so nice looking, they could have just bent some sheet metal and done it right..... ohh well, whatever.
At least that 64 listed above appears to have been a good use of an unwanted 4dr car. I think I'd have welded the doors shut and made sure to reinforce the car some, but otherwise it seems like a neat idea (despite being roughly $1500 overpriced)