Here is the opening where the floor was removed. (A) This area of the trunk floor is an overlap weld. Drill the spot-welds out and leave the portion underneath. (B) Also, spot-welds hold the trunk floor to the framerails. Drill the spot-welds out. (C) Where the floor meets the trunk extensions, cut the floor about 1/2 inch in (on the trunk-floor side) from the seam. When the old floor is gone, the remaining piece of the floor can be removed with a grinder or cut-off wheel from the extension. Finish cutting the floor loose at the rear portion and take it out. Section D was rusted out, and since no repair panels are available for this area, a new piece of sheetmetal will be added.