I think you have a good idea. I am out of the US for a while but I have a Taig Lathe in storage and I plan to CNC it in the future. Before I do that I be getting a Taig CNC mill from deepgroove on Ebay.
Seeing the Slant Bed CNC conversion of a Taig Lathe thread here gives me a good idea of how to proceed in CNCing the Taig Lathe.