I ordered the OpenBuilds MiniMill from the OpenBuilds Parts Store http://openbuildspartstore.com/ They were out of Motors and Electronics when I ordered so I had to source these items elsewhere. But it turned out well doing it this way.

A simple to assemble, super clean and safe PSU case solution that fits into the OpenBuilds wire management ecosystem

Build using standard parts as much as possible, Open Builds etc. To keep printer usable for more materials will be trying a heated bed with rotary elec union for the thermistor and power.