a) first I wanna apologize for my english I am french from Quebec Canada .
b) I never tested the force of high torque stepper motor so I will use the keling KL23H2100-30-4B with 500 oz/in 3 amps nema 23 bipolar stepper motor just to be sure.
c) I think I will use timing belt with homemade small gearbox with timing belt or helical gear
d) That CNC will be to make an other one better and more accurate version 2011 maybe lol. I you have some comment feel free to post them
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e) Did you already made one or think to build one too? I will post my progress time to time and if you are new also maybe I can tell you want does gave me great result and how I did. have a great day.
Louis