Tower Hobbies sells wings and other airplane parts. They are not particularly cheap however. www.towerhobbies.com The Giant Stik wing would be good for a Ryobi project. It has over 1500 square inches of wing area which is a good bit and which would make up for the relatively high weight of the engine and other components you wish to use....

Giant Stik wing only: http://www3.towerhobbies.com/cgi-bin...&I=LXKJY1&P=ML

AV8TOR