Just bought a part finished Rockliff D with a working size of approx. 900mm x 600mm not sure of the Z. The guy who I bought it from had to give up the workshop that he had. I have taken it apart and propose to strengthen it in various ways in the hope of getting a bit of speed from it. I'm using 4no. 270oz Nema 23s driving M8 threaded stainless steel rod for screws. I am making some anti backlash nuts although I'm not looking for super accuracy. My reason for contacting was to ask if Lee Roberts ever finished his Rockliff as I can't find any trace of it.