I have read where the wing bolts can sometimes come loose while flying. Instead of using the bolts to hold the wings on would it make sense to cut the heads off of the bolts and glue the threaded part into the wings forming a stud so that a nyloc or a nut could be used when mounting the wings to the fuselage? You could drill a hole in the stud for a safety pin to keep the nut from coming off in flight in much the same way as you pin the anti-rotation dowels. It seems that this would provide a positive way of attaching the wings with very little risk of them coming off in flight....