On my 90 Zilla, I hacked off the rear end & modified a Honda 400EX sub-frame to fit. It's all a bolt on deal. If I had to do it all over again for a dedicated drag build similar to what you are doing, I would fab up a bolt on sub-frame out of aluminum tubing. Just tig it together. That would be a substantial weight savings. Trick looking too! Keep us up to date with the progress. It's gonna be a killer ride that's for sure.