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-knife-engraving-machine-drill-set/32662986876.html?spm=2114.01010208.3.20.pIn1J8&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10069_10084_10083_10086_10017_10080_10082_10081_10060_10061_10062_10056_10055_10054_10059_10078_10079_10073_10070_10052_10053_422_10050_10051,searchweb201603_7&btsid=60efac34-5e90-46fc-85bf-fe4b487d443c ;
1 x Johnson motor 81026, 12 VDC, 19000 rpm (size: 48 mm diameter, lenght 69 mm, shaft 5 mm and 10 mm long, 3.73A);
1 x PC PSU ~350-400W good one or 500W cheap;