lennyk,
Yes, with the weight of a gas engine, I didn't want any failures. So the center section is glued and glassed.

basmntdweller
That small wrinkle is torn and the balsa under it is cracked. I put some CA on it (20th flight) to keep it from spreading and it hasn't gone any farther. If you look at the fit where the wing and fuselage meet, that area is soft. I was thinking of glassing the wing out to the fuselage but didn't know if that was the right thing to do. I guess I should ask Ann Marie.