Ah, makes sense now.  I had missed something!  Personally I would use a machined pin hinge bonded into a carbon bracket but if you want to go full composite you could make carbon blocks that have a piece of thick mylar bolted between them.  I've used mylar hinges in my plane before and they are OK.  Just make sure you pin through it.  I wouldn't recomend the flexible resin for this, I'm not sure it has the flex you need.