figured out today that the factory rear wheel opening on a tj is about 1.75" higher at the highest point than my comp cut yj rear.
Pretty much set on cutting the frame of just past where the factory b-pillar mounts to the body, where it starts turning upward. And rebuilding it back with a combination of plate/ YJ rear frame/ TJ rear frame/ and 2x4 rect tubing.
Then....
reattaching tj rear sheetmetal and trim the rear openings but keeping as much as possible.
The key thing i want to accomplish is still allow me to put a top on the jeep, and to keep the inside isolated from the outside, which means a lot of sheetmetal work in the rear "bed area and wheel wells