I finished with the first phase of my current project. The first phase is the frame and lift, and the second phase is the track and elements. The ring is 6ft diameter, made from walnut, and has 8 holes for picking up the marbles. The next step for me tomorrow will be to make the lever that will push the balls out at the top, and the track where the balls will be picked up from the bottom. I'll post another picture tomorrow with details of how the marbles will be pushed out.
Finally, this is how the drive roller is mounted to the frame. I have a C clamp holding it on until I get to the hardware store and purchase the 1/4-28 nuts I need. Good enough for now. To keep the steel from twisting I added the support "kicker" under the motor. Since the wheel is almost 10 inches from the wall there is quite a bit of torque applied to the 1/2" steel tubing. I'll have a movie posted soon.