I must say that I've explored quite a bit, and there's very little information on making routed digital XLCs. Still, I thought I'd experiment with some. I took apart an old Scalextric XLC that I had lying around. I was hoping that I could use the flippers and electronics for the routed XLC. Took me a long time to figure out how to get the flippers out of an XLC--they have a screw on the bottom that must use a special tool in manufacturing. I found out that the Scalextric flippers are much thinner than the depth that I've routed. I tried to find a longer screw to put it into the MDF, but the screw is apparently a specialty size. I'll be puzzling with this for a while. Suggestions welcome!