The mouse mechanism is pretty simple. It didn't start out that way. As per usual, when you start out designing something it always has more strings/rods than it really needs. The objective is to simplify the movements to what a puppet really "needs" to as informed by the script.
The mouse needed to scamper along, "sniff" it's nose and whiskers, and wiggle it's butt.
To do this, I based the mechanism around a really large spring.
The spring forms the "neck" of the puppet. This allows for a bit of bounce as the puppet moves. It's mostly hidden from view.
I also embedded some wire into the fabric to have a point of attachment for the fishing line we use for the puppet controls.
Mouse in the studio! It will take a while before I can show movement footage; I like to attach handles and paint all the rods at once. (Saves time!)
I hope you've enjoyed seeing how we get from here: