the sheeting when glueing the ribs and formers to it, place sub leading edge and sub ribs.
Place the trailing edge from 2x12 balsa sheet, place also some scrap balsa before the trailing edge to
support the wing fasteners
Place aileron formers from 10mm balsa in the ribs by taking out a small piece of the rib , place scrap
balsa fill in the horn and hinge positions