I have found some CADs and other dimensions drawings for the standard lower third for WPC, Stern, etc. All of these are the traditional Italian Bottom, with two inlanes and two outlanes. I know there are plenty of playfields, new and old, that use three inlanes (two left, and one right).
Does anyone have drawings or dimensions of how this works? I know the flippers are a little higher and to the right of a standard playfield, but not sure how far they are adjusted. Any help would be greatly appreciated!