After a little thinking, there is finally a direction for this project. The ideal outcome is to create a generic control board that will allow the use of any sensorless mechanical drive system in a closed loop system. The board will include basic H-bridge and servo PWM drivers so that users can just plug in simple DC motors and have a working CNC. It would be nice to have a full self calibration routine which allows the board to auto identify the axis to make it even easier to use. 

The board will most likely have a camera, fpga and a micro. With a bit of luck the BOM should be less than $25. And with cheaper hardware, it should bring cheaper CNCs.