Thanks for the tips.

The trailing edge notched and about 1/2 inch thick so surface area would not be a problem I think, and those ribs are glued tight .

The instruction manual of the LT-40 is brilliant. Tells you exactly what glue to use and where. Medium CA is called for most of the building work (Even joining when joining the wings together, but using epoxy seems like a better idea) and then after the construction of the wing it is advised to reglue all the joints with another coat of eith thin or tick ca ensuring that a small but visible fillet of glue is seen.