Hi Richard, I have found a promica build thread that it similar to your CNC conversion. He only bought the hardware / motor from Mark and the controller is a Gecko G540. I was checking this type of controller at ebay and the cost to build is very minimal :-) ......and by the way, thanks for sharing :-) :-) :-)
http://www.cnczone.com/forums/bencht...-x3-build.html