Mach2 and the newer version 3 can do the sync'd (I'm from Arkansas and understand your language just fine! ) axis' thing for you and still have 5 axis control. As to your decision on the ball screw...just curious if you have considered rack and pinion? Other than the z axis clearance, those dimensions are about the size of my machine which has used rack and pinion for 13 years now. I still get quality parts off of it. N/S/E/W Texas?