Quoted from o-din:there would be a swinging target with a drop target on either side.
Cool idea, but won't you end up with two broken drop targets? (The swinging target may push the ball into the corner of the drop).
Also: for the cost, don't forget the labor cost, which is killer in an EM. More wiring needed.
I'm designing a stand-up EM arcade game currently. Will be assembling soon to test my schematic.