The best place to get a cnc drill mod is from the scrapyard, but if you don't have the patience for that then we've got a quick guide for you
The basic idea behind these mods is that you get a bunch of parts and cut them up. This will give you an assortment of different drills and bits that are perfect for your needs
You'll need to know how to weld (or at least use an oxy-acetylene torch) and some basic fabrication skills, but once you've got those down it can be done by anyone.
cnc drill mod for state of decay 2