How do I add CNC to a lathe?

OK I'm hooked. I just finished the hardware end of converting my
Bridgeport to CNC and now I'm ready to tackle my lathe. Problem is,
I'm clueless from a mechanical standpoint (I'm OK now with stepper
electronics and control circuits - I think) where to begin.

I have a Logan lathe circa 1943. The max swing from the center of
the chuck is 5.5" (does that make it an 11" lathe?). The gears to
make various threads have to be hand changed on this model. It's
belt driven. It does have motor driven feed on the carrage and the
cross feed. Any guidance on where/how the motors should be mounted,
as well as any other mechanical things to look for would be
appreciated. Any place I can look for diagrams? Is this project
even worth it or should I leave well enough alone?

Thanks and regards,
Jeff