The trailing edge of the wings has a bend installed as a stiffner on the inside edge. On mine this edge looked like it was a little long and may possibly hit the fabric. I had previously trimmed and filed these down but just to make sure they don't rub a hole in the fabric I installed a piece of oratex over the sharp edge between each rib. I also layed the bottom fabric on the wing and marked where the glue goes and made the cuts for the lift and jury strut brackets.