By the way, the hinges I'm using are the pin kind: two pieces of plastic held together with a small pin. Can these fail? They seem pretty darn resilient from the way I pulled, pushed and wiggled them to fit in those dreadful slots I made.

I had originally thought of buying the Great Plane's PT-40, but when I went to the LHS, the owner recommended the Midwest aero-star instead saying it was better. She was kind enough to have the patience to assemble everything I would need from glue to hinges to wheels (even suggested a slightly bigger size than called for). She's the one who suggested the dubro pin hinges.