I've attached the dragonfly wings to the box ready to be connected to the pendulum. I've connected the wings together in diagonal pairs. Front left to back right, front right to back left. That way, as the front pair move up and down the rear pair move down and up.
You can see what is going on better in the diagram below. Green parts are a single unit as are the blue parts. From the diagram you can also see that I only need one pendulum. Back to the drawing board!
Here's what it looks like when I haven't scribbled all over it.