Hi David, This has been bugging me for a good while thinking it would be a difficult repair. Repairs have gotten easier for me so I formed a domed piece that matched the damaged area. I laid a large washer over the damaged are and marked a circle. I used a rotary burr to cut to the line. Then I laid the repair piece over the hole marked it and the line up marks, cut close to the scribe mark with snips and sanded to the scribe marks. The repair fit great and was easy to tig weld. The domed shape and the repair being a circle there was no problem with warpage. The metal was not in that bad a shape. I believe the damaged area was punched thru from contact with the vent fitting on the rear end. I find it hard to believe that is possible but all indications are that this car was not maintained, and definitely abused during its life. They only fixed what needed to be fixed so it would move, did not matter if something else was damaged in the process. Also thank you for your comment about welding up unnecessary holes. the seat area had a lot of sheet metal screw holes, all are welded up. It was reassuring that I wasn't wasting my time. Have a great year, Frank