According to the rules, it has to be tethered, so you could just make a switch box, each one leading to a motor. it also says you can use servos. This might be a good idea for the horizontal switch flippers. try these:
http://www.intelspy.com/18gmirecose.html
Good Luck!
EDIT: although, i don't think you can control a servo with a basic switch box, it needs a PWM input, too bad, it would be great for presice movement, like fliping a switch!