Ive been considering building a gypsy thrasher. 2 way mirror so you can only see inside when the light inside comes on. use the coin deposit slot as the trigger. put something munching on her skull so shes being attacked. water pump to send blood streaking down the glass. once they let go of the coin slot itll shut back off. i figure that i could use a wiper motor/s to flail the arms. what im trying to figure out is how to control the abdomin of her. a wiper would give you either a side to side or a back and forth motion. any ideas of being able to give her more of a 360 degree range? maybe a ball joint on a motor of some kind.