Moondog
You may have seen this already.
http://www.cnczone.com/forums/showthread.php?t=4327
I just looked at this thread quick now, it seems to have been changed (I had read the whole thing a few months back).
IJ (your fellow countryman) had a very huge thread on his complete knee mill conversion, including his trials & tribulations with his Z (knee drive).
Maybe you could get in touch with him.