I do nothing but give RC flight training and have a few trainers ready to go. All have been converted to bolts. If you are a half way decent pilot, you shouldn't have to worry about "landing" on the wing tips thereby causing a lot of damage.

How I made the conversion is to cut a 4 inch slice on both sides of the center ribs and glue pieces of 3/32 plywood on both sides of the center ribs. Then I glue a dowel between the plywood with balsa to take up any space left. After everything is lined up, I epoxied fiberglass cloth over the dowel conversion.

On the trailing edge, I used maple blocks drilled and tapped for 1/4-20 bolts. To line up the bolts on the wing, I screwed in a couple of cut off 1/4-20 bolts and pressed down the wing to make indentations where to drill the holes. I did reinforce where the dowel goes into the fuse. The rest, you might be able to figure out yourself.

Take care,
CCR
http://www.kites.org/rc_instructors