You should check out the Guillow's rubber-band powered airplane kits, -EXTRA-:

http://www.guillow.com/GuillowDetail...=22&FamilyId=1

I built this lancer kit, and it took me a good long time. It was pretty educational though, and I was pretty happy to finish the thing. This is the kind of thing that kids used to build back in the 30's, 40's, and 50's.

I took my Lancer kit to a club show-and-tell and then later launched it in a gymnasium. I couldn't have been prouder than, when on my second flight, the plane flew perfectly clear across the gym and I got a standing ovation from the rest of the guys.