I wonder if you could use a sewing machine motor? I went to garage sales today and saw litteraly 6 sewing machines or more. That would give you a motor that turns slow and with a little more cord for more extension you could have a foot operated motor that turns slow and I bet you could do it pretty cheap. Another idea I like is the dueling tree with rubber blunts. you know what I mean? 6 targets mounted on a pole 3 for one guy 3 for the other you take turns shooting them over to the other guy and he has to shoot them back, and at the end the guy with the most on his side looses.