Jim, if you've still got a little time and want hidden hinges that will work with the bird catcher look into fabbing a pair of parallelogram hinges. I've built a few sets and they let the hinged panel move almost parallel to the surface it closes against for quite a distance. Start with cardboard and screws to mock up the geometry. It's really not as hard as it looks. Staggering the link lengths allow the open position to be any angle you want. Same principle as a stock hinge with infinite options.