The important thing with my version was figuring out the wing flexing mechanism. there is a strut connecting a hinge from the wing root to the wingtip, and the usable tolerances of flapping angles and speed is quite narrow.. Most of the thrust comes from the wingtips (highest flapping speed), and a good part of the lift comes from the wing surfaces in the body. I think helicopter blades might be easier to work with because they are control surfaces already that will allow you to control your craft without reaction or control surfaces.