Mini Mill/Router

My mini milling project. Basic parts used for it:
UnoR3 + CNC shield(V3)+ 3x drivers;
3 x Nema17;
12 x LM8UU bearings;
3 x 8mm trapezoidal rods with 2mm lead;
1 x DC motor controller like this one - http://www.ebay.com/itm/Max-8A-12V-24V-DC-6-30V-Motor-PWM-Speed-Controller-With-Digital-Display-Switch-/131585225915?hash=item1ea31734bb:g:oaMAAOxyaTxTWMQg ;
1 x spindle clamp like this - https://www.aliexpress.com/item/spindle-machine-tool-clamping-rod-ER11-shaft-5-motor-lengthened-clamping-kn