ORIGINAL: LuvBipes
Yup, looks like external hinges are the way to go. Homepylon, that's a beautifull looking Cub you got there. I too build a Sig kit, the clipped wing version. Here are a couple of pictures. The Pilot Decathlon is shaping up very nicely - it seems to have a very scale outline, but I must say that the almost non-existent instructions proved to be a challenge.
Homepylon-- I had to look twice at your finished plane picture- until I saw the OS cylinder head, I thought it was the full-size plane that maybe you used for reference--that is one fine looking aircraft.
LuvBipes, your Cub is just as awesome, I love the Hazel Sig paint scheme. What size Saito is that? Here's my humble attempt, second plane I ever built: