Looks very tempting. I wonder what it's periodic error is and how easy it is to polar align. 300D would look nice sitting at the top of one of those
The drive system is by Sidereal Technology and has the option to chain two units together to also drive field de-rotation motor for altaz photograghy and focus motor. If you can buy your own gearboxes the setup is only about $650 USD with two servo motors It will do GOTO as well in conjunction with a laptop or Argo Navis.
I thought that periodic error is determined by the size of the gears and that horsehoe mount design because of it's circumfrance size (which the equatorial platform is a cut down version of) did not exhibit any periodic errors at all.