Hi Bryan,
on Little Gypsy Girl's sails I left an extra 4 inches all round the sail, then stuck the webbing down outside the line of the edge of the sail with double sided sellotape. I then glued the outside 2 inches to the webbing with contact cement and then turned the edge over and glued it to the sail. Finally I put three rows of stitching through the whole lot. It is very strong and was very easy to do. At the corners and angles I crossed the bundles over and stitched the assembly together. After surviving the gusts at the AGM meet with no damage it seems to work!!
All the best with the sail making. David.