looking at converting the above but its the one with the larger table but less space underneath for screws. after getting some dimensions off the X and Y slide and the size of 16mm and 12mm ball nuts I think there is enough room, with a little machining for the 12mm nut, just. OR has anyone fitted screw to one and how did you go on??, plus is there any down side to using 12mm ball screws over 16mm.cheers