Hi Mike,
That's a great way to do hinges. I do it a little different, I use dubro hinges, remove the pin and install a 1/16" continues music wire, turn the music wire at the end attach the music wire to the wing tip. This way it seals the hinge line and I can remove the flap or elevator. I sleeve the control horn so if I need to adjust or make a bigger or smaller flap or elevator no big problem just remove her and replace what is needed. This works great for me, a little more work but has been a life saver for me. Have a great day, Gary