clifm, i have looked into that, and i have always had some trouble with sanding too much. the plastic parts that came with it for the wing strut caps dont work so well. i dont really ever replace the plastic with balsa, but i found that the best solution to my problem with this one. i am still deciding on how i want to make the pistons. i want to use the plastic parts, but the plans do not have very good detail on the engine, so im not sure how i will do that. i do not want to make it too complicated.