I have a pneumatic pop up zombie using the 4 bar set up. But I want to change it up a bit. I want the figure to be standing up right and then go forward toward the people. Anyone seen any props like this. Also it has to be free standing in the yard. I have a cylinder and manifold valve. I need it to work off a motion sensor. I dont need it to move very far. Maybe a foot. I just want him to go toward the fence. Thanks.