Spending the holidays back in San Diego, I managed to get a few more things done on the build. I added the piano hinge to the flap and sandwiched it under a layer of thin ply. Can anyone explain to me why the piano hinge is the go-to for the SBD? I must be lost, but it's not scale so and it's a real pain to work with these things. I recall Sam writing how fun it was to pull the wire out. Yah, I agree. Works better with a .031" wire. Anyway, I'd be interested in hearing more about the genesis of piano hinges on RC planes.