I've now completed a working wing model, the basic foundation of the wing. The model closely follows the bone structure and movements of a real duck's wing when closed and opened. There are two movements and control strings: one to open the wing and one to make it flap.
The "elbow" joint took the most effort, having to both fold and turn simultaneously - I think it took three tries. I'm hoping I'll be able to reduce some of the wing's thickness after the next step.
Now its onto the feathers: As the wing opens the Primary and Secondary feathers unfold evenly over each other with the Tertial feathers covering over.
I've been concerned from the start about the collective friction from all the feather's individual springs. We'll see what happens...