I agree with Janh...The after market items are a cottage industry in them selves. I'm sure I have spent more on the am stuff than the kits cost! My Gotha was $150 and I have spent $200 on the am parts. My AMC DH-2 is the same way, and the SE-5a is headed that way. And now with the new Taurus U.III engine, the new Fokker E.IV is climbing in cost. This stuff cost more than drugs for the same effect!! But you gotta love it!