If you have any doubt then soak the ribs and doublers for the retracts with thin CA glue to toughen the wood up. Then use epoxy with 3/4 ounce fiberglass cloth or tape to laminate each side and blend to the wing spar and spar webbing. That will be more than enough to toughen the ribs up. In addition the wing sheeting will help further if you cover the top first and then add a square of fiberglass to the inside overlapping the ribs, leading edge and spar by about 1/4 inch. You can use carbon fiber instead like a 6K cloth. You can also use filler like micro balloons or milled glass fiber to make a paste that will help you fillet the edges and help the cloth lay up the corner.
Hope that helps, keep posting pics of your build!