I used to have a bookmark to a thread that showed how to chop a fast back but it must have been deleated sam.
I have seen these done a couple of different ways including ones that remove the entire section from the rear window down and the sides that the rear fenders bolt to and rework them to ones that just rework the area below the rear window.
The ones that look really good also do section work to the trunk lid to get rid of the hump and get the right flow. The thread was of a Caddy fast back being chopped over seas and was on the hamb.
Sorry that I can't help you more.
Torchie
I have several threads on how to chop them different ways, and there are even a couple on RRR (including mine). I was just curious as to how this one was done. It looks like he left the trunk alone - maybe like Carnut did.