Hey there, wood is often the main part of building gliders and other balsa/bass wood events, but you can use the other materials listed in the rules manual. Several kits utilize this; I think the Protege has a carbon fiber fuselage (for strength and to be light), and you can use foam, glue, etc. In theory, you could even make a paper airplane, though that probably wouldn't work out too well. Honestly, whatever design you use will have different specifications. For your wing example, you would want to use A grain balsa wood for flexible wings and C grain for more stiff winged designs. You can also attach light materials to increase surface area. Good luck!
Fossils, Solar System, Elastic Launched Gliders