I use hinges that I can REMOVE the metal pin somehow. Or a piece of THIN plastic material.
I have vise that clamps a Moto drill with a THIN cutoff wheel in it. I clamp a guide piece of wood so I can cut a CONTINUOS slot in all hinge slotted pieces. I use a 36" long piece of wire thru all the 1/2 hinges in 1 surface piece. Slow epoxy is used to get total floppy action. That rod ....IS THE SAME DIAMETER AS the original pins in the hinges. I do all surfaces that way. A slight 90 degreed bend on all of the....Brass..... rod ends. Done You can put bevels on the wood edges to help air flow over them. I see no difference in control response.