ZISBAK

Hi, Just wondering if anyone would have any ideas, If I were going to try to set up a Targa top on my Z, how much would that affect the integrity of the frame structure, and how does the Convertible hold up on their frame? Because I have a friend with the body shop that could do all that for me, but I was wondering what I have to do to make sure that would not affect the frame and body structure? Just curious?