You've gone beyond what I've had to do in the front. As for the back, I was fortunate to have the trunk floor and extension already done. But when I took over i took one panel at a time to maintain solid reference points. There are other with more expertise but I would think removing the floor and rails would be first so that the quarter panels and wheel wells are kept in tack and solid. But, honestly, I am a novice so my approach is probably ultra conservative compared to others. Kudos to your workmanship! One caution I've read in Mopar muscle is if you need to cut into the package tray and supports. This area is critical and for sure should have bracing since so many point hang off it, dutchmen, wheel wells, quarters.