Nice Job, looks identical to the LatheMaster.
You will find the tach will give you nice precise speed control, When you make the enclosure, make sure you include a cover for the motor! It is right in line with the the chuck.
I used a 1:1 timing pulley set up.
Note the 2"+ square hole shown going under the bed, I installed a 2" piece of rigid conduit right to the end of the bed to bring all the CNC cables over to the enclosure end.