I had to use a straight bar to guide the mouth up and down and a series of springs in order to make the mouth move properly. The eye control is the basic L shaped groove control.
Here is the result. I covered the back and the top of the mask with fun fur and now he is being utilized as an articulated vent figure by the amazing Peter Hefty and company. Thank you Peter for your trust in me to take on this project for you. I hope he brings laughter to millions!