Dave, unfortunately I know only what a 4th axis is so I cannot be of any help to you, sorry
I will be a definite interested bystander though
On the Haas it cost thousands of dollars to just hookup to 4th axis and I believe a couple of thousand more to turn the controller on to recognize it, plus software and I think $5000 for the basic rotary table, I am not broke but sigh, I do not see it ever happening without some serious paying jobs, and sigh again, that may not happen either.
I am quite happy for you though, and just a bit envious