Summary

Stepper Motor Mount - NEMA23
CNC Conversion for Harbor Freight Mini Mill

Hardware shown in picture:
4x M5x25 Hex Head Screws
4x Matching Nuts 4.3mm in height and 8.2-8.25mm width
2x M6x20? Hex Head Screws
1x NEMA23 Stepper Motor

I will add an Oldham Style coupler to this design when I get around to it.