I haven't started my Caddell A36 yet but I see the nose retract as a challenge since the retract used in his design is long gone from the market. The closest I could find was the Robart gear designed for your kit which should work out find. Caddell sold corrugated skins for his control surfaces but none are available. I plan to over come that hurdle by using a little thicker Balsa skins and routing the grooves using my Dremel router attachment and a homemade jig. Sometimes I think the best projects are the ones that teach you new tricks.