The Firebird had a lot of ancient fiberglass filler in the old floorpan. Any filler or seam sealer over any metal seam had to be removed and each area thoroughly cleaned to prevent weld contamination. The center of the floorpan was rough-cut with Hypertherm’s Powermax45 plasma-cutting system, leaving plenty of room between the cut and the edges of the floorpan. Under the car, we used the plasma system to create small reference holes around the rear framerails. A reference chalk line was drawn to show exactly where to cut.