The 'Change-o-Parts', based on a cast of David Naughton's body, included the head, hands, legs, and back. Their skin was moulded in 'Smooth-on #724', a urethane compound with considerable stretching abilities (and also "delightfully unpredictable," according to sculptor Tom Hester). All of them functioned through similar principles. The pneumatic rams that caused the exterior structural changes were home-made air rams, with a large syringe at the operating end and one or more normal-sized syringes in the end that was internal to the puppet. The syringes faced each other, with needles replaced by plastic tubing. When the operator pushed the plunger on the operating end down, air pressure would push the smaller plunger out at the other end. An acrylic form representing the mutated shape was attached to the end of the smaller plunger. Thus, when the plunger was pushed out, the shape was pushed out against the skin, creating the change. Certain parts were also constructed as make-up appliances, and subtle changes were included in each stage of transformation.

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