How are you generating your G-Code? Drawing in Inkscape or Fusion 360? Are you using a kit from someone and if so, do you mind sharing who? On my Cheap Chinese Mill I just went with digital machine scales on all 3 axes and ended up with a 'poor man's DRO' that works great. I also built a Shapeoko CNC router and beefed it up a little. I recently finished a 20-week course in CNC Operations at a local Tech College to prep for a new career path, so I know just enough to be a little dangerous ( 'I don't have a License To Kill, but I do have a Learner's Permit'). I've been a garage/hobby machinist for about 20 years.