If you go here you can get a 3" rotary table that you can convert to CNC .
What about a similar rotary attachment used for this laser?
It uses one of the existing axis so you do not have to have a 4th stepper involved.
Oh if everyone here only knew what I have been up to. You all will see soon enough in the coming weeks and I think most if not all will be pleased.
Dare I say the name here but talk to phil he has made his xcarve 4d