I just finished welding in a new lower and upper cowl and have started on the back of the car. I am replacing the floor (1-piece), rear transition panel, and trunk drop-offs. Everything (i.e. suspension) is out of the car. Currently, the floor back from the seat risers is cut out, along with the rear transition panel. Pic below. My rear TB upper is heavily pitted and I plan to replace it. The replacements came with the Dynacorn floor pan. The rear of the car is on jack stands under the pinch welds of the rockers using the rubber blocks for pinch welds on the stands. The front is supported by the front frame rails just behind the front torque box. The car is level. Before I remove the rear TB upper, do I need to support the rear of the car more than the jack stands under the rockers? Will removing the uppers cause instability for the structure of the car? Any tips/tricks for replacing the upper rear TB and rear transition panel will be appreciated, thanks.