(Samantha, Maureen; How many women are on this maillist? This is an incredibly varied group from all over the world.)
To the question at hand: Builders of the BD-4 have been dealing with the need to create new wing-skins because the panels provided with the kit were polyester and meant to hold fuel. They didn't. Many made female half-molds out of wire-cut foam, lined with hard-finished plastic sheet in which they molded epoxy/glass skins . These are bonded to ribs and spar just like Diehl skins, and retain the perfect finish of the plastic-lined mold. Elegant and wholey in the spirit of the KR. Peter ________________________________ I must be missing something here but if you set out on the long road to build an aircraft and that aircraft is of composite construction why would you want to build it fron plywood and or alluminium ? If your not happy with the composite technigues then build a Jodel or Thatcher MarkAnd i wouldnt be comfortable putting screws into the main spar. That would create a path for water to possibly get to the spar and weaken the effectiveness of screws and the integrity of the spar.