I had a full frame, 1987 Buick Regal that I made into a convertible, Grand National clone. I grafted on a power top from an early '80's Chrysler "K-car". Got some compliments on it too. It was stolen in Chicago from the street right in front of a friends house. When recovered, it was stripped clean of eng/trans and GN goodies. except for the 4.11. They even cut the hydraulic lines for some top-down joyriding becuse they couldn't find the switch.
I can tell you that even with a full frame you will lose a lot of structural integrity and it will never be as tight as as a hard top unless you go with a 12- point cage or better. Most serious racecars are hardtop for this reason. Otherwise, I'm sure they'd shed the top to save some poundage.
Having said that, if anyone wants to donate their VX to me for some nip/ tuck, just bring it on over![]()