You don't need to use 2 oz. glass on the wing. .5-.75 oz. would be more than sufficient. Especially if you are concerned about the weight. Using carbon fiber is an excellant idea, very light weight, yet extremely strong. To ensure a better bond, use 60 minute epoxy. It takes forever to cure, but the end result will be a superior bond than 30 minutue epoxy. If you plan on racing, than you definitely do not want to skimp in the strenth department. Good luck.