Screaming Injun.....Since I will do snap rolls with my cub I beefed up the spar with 3/16 inch strips of yardstick so the spar cross section at the center 36 inches is an I-Beam. Less weight gets added that way. What is your weight and engine? I will use an OS 46FX and hope to keep it well below 8 pounds. My wing is all 4MM. I cut out the ailerons from the top and the bottom of the wing. This was complex since I had to build up the ailerons and also the hole in the wing left by cutting out the ailerons. I'm using four Robart rod type hinges on each aileron, inserting the rods into the wing top surface flutes. A coating of Permatex Silicone Adhesive/Sealant holds the rods inside the CORAPLAST flutes.