I'm still working on this.. The holdup now is trying to figure out how to true up the chuck faceplate before bolting the headstock down.
I wanted to measure a long bar held in the chuck, to align it with the Z axis, but I've found out the faceplate is not running true.
I'm amazed it worked as well as it did when it was mounted to the harbor freight 3 in 1.

I guess I have to get the axes under power ( a whole project by itself, decided to sell the stepper kit and go with 400w AC servos), then clamp the headstock down, and machine the faceplate.
Then mount the chuck and a test bar, and align the headstock to the Z axis. Then finally I can drill and tap the mounting holes.

Hopefully I'll have something to show soon!