Spent several hours but made just a little more progress today. On the roof over the large doorways there is a lip that diverts water. It extends the width of the opening. I filed off a bit to match the reduced width of the opening. Then I glued back supports in the top of each doorways to support a side panel that is positioned just below the roof edge and extends end to end of the car. Finally tried making rivets on the narrow panels above the doorways. Next task is to make and glue rivet panels on the sides. My rivets are not good but getting better as I gain experience using the rivet tool.