Mike...I do remember the hinge method you speak of...many moons ago in my control line days we made hinges out of silk. This is a cdiss cross type hinge that was actually easy to do. I have also used 2 pices of Monokote...this was done by cutting 3/4" strips of Monokote turning one strip glue up and ironing the other strip glue facing down letting the top piece over lap the glue up piece by 1/4".
Thanks for the heads up on the Granite state hinges Mike...had forgoten about them.