The wing started out flat bottom with ailerons. Then before covering I got a bright idea to make them semisametrical. So what I did, and it might not be the thing to do, but I cut just the curved area and glued those pieces to the flat bottom to give it the rounded bottom. I cut and sanded them at one time to make sure they were all the same.. I added them to the bottom of all ribs except the ones that sit on the cabaines. The incidence really didn't change from the flat wing. I also used the incidence meter to check for wing worp.