It seems odd to me that the dive had anything to do with the wings sliding off of the tube. If possible, I would modify this aircraft to the conventional method of running a bolt thru the inside of the fuse, into an appropriately tapped hole in the wing. Access could be the issue here, but it would work if possible. Although the G10 should be fine as well.
Like I said, this is a really nice looking plane, and would make a fine model. If you can overcome all of the weight they built into the tail.