I was in contact with Nat, at: www.GannonAndBenjami.com where he said I should stay with a Marconi sail for the Gypsy sailboat. I must make a small Jib and Main sail. I bought some polyester material that is water resistant at a local fabric store. Not much required, but I know that one can not just cut from a 2D plan the cloth and attach it to the mast and boom. I have been studying how to make a Dacron sail.
This is a 1941, Comet kit. I used the old kit’s wood as patterns while making parts from birch ply, basswood and mahogany. The scroll saw was a big help in cutting the printed parts from the old wood. Wish I had one when cutting printed parts for rubber powered airplanes.