I have had a Smithy 1324 since Feb. 1999. I have not converted it to CNC, but I did add a three axis DRO system a few years ago. The system I chose was the CBX Digital Display (from Shooting Star Technology). It has really made my machine so much more fun to use and has greatly increased my accuracy and repeatability. This is the same system that Smithy offers (or used to offer) in their catalog, but I went through Shooting Star directly. Smithy was able to provide me with how they recommend installing the DRO.
The system I have has been replaced with a newer display with more functions.
I am not selling mine, but thought I would let you know of one that works well with a Smithy.
If your interested in discussing further, e-mail me at firstname.lastname@example.org.
Hope this helps,