Maybe a little late, but assuming you'll be at a field where glow fuel is allowable, Balsa USA Stick 40 plus is easy to build, easy to fly. Takes a lot of abuse to hurt it, but nobody is going to say it's pretty. It will fly quite well with a .29 Fox, so don't go for the biggest mill you can put in it. You could use a .60 and the only thing you'd gain is a little better climb. Designed for a .40, and that's all it needs. I've seen them cartwheeled on take off, straighten the wing and go for another try. It's rugged.
Rich.