Pretty much the standard Rostock design. I used aluminum tubes for the arms, and since I already had a bunch of plastic-coated stranded steel actuator cable, I set it up to use that, with some pulleys I turned on my Atlas lathe, instead of toothed belts. Using Repetier firmware and host and server software. I started out with Pronterface and Marlin firmware, but Repetier is working much better for me. Still getting the hang of it, and still have some fine-tuning to do, but I'm happy with it so far. Thanks, Johann!