As you can see in the included pics, the back roll up pan is a 2 piece unit, with the seam right at the top of the hump. I also included a pic of how it stitches to the side of the inner rocker. If you look at where it is fastened to the floorpan you can see an overlap where it is spot welded together. I was investigating just how this goes together and discovered that the rear pan that goes up and over the wheels is actually spot welded underneath, to the next rib back from where the roll-up pan fastens to the floorpan. This is going to be a difficult area to remove cleanly and save every section but I will have it apart soon and include all those pics also.
I can't wait to get this and the car prepped, and start welding!! I'll keep you posted as I go!! Geof