here's the frame for the one i made
here it is bulked up with plastic grocery bag, newspaper, and duct tape.
and finished
the head only moves left and right. a pvc pipe went through the cross in the shoulders and fit into a slot in a bike helmit strapped to my head. i made an s type shape out of 90 degree elbows between the neck and the head. this made a stop before the cross and gave the head a sweeping motion rather than just turning on an axis.