Just a quick note about WHY the "lip" along the bottom of the ball corral is necessary. Without it, balls pushed into the ball corral bounce off the back of the corral and roll right back out. This would make it very difficult for the human player to collect balls to throw, as she (we all saw during the kick-off demonstration that girls make better human players for this game, didn't we Jason?
) would constantly have to grab balls as they entered the corral, leaving little time for throwing.
Also note that the "lip" is actually set back behind the plane of the diamond plate of the player station, about 1-1/2" This means that the center of mass of the ball would have passed the plane of the diamond plate before it hits the "lip." Most of the time it would bounce up behind the diamond plate, and into the corral, rather than back out on to the field. So this should not be too large of a concern.
-dave