Thanks guys!
Nathan, I've got a Clausing 8530 mill. It's a pretty nice little machine. Only thing I wish was different about it is it would be nice to have more Y-axis, but other than that it's been able to do what I've wanted it to do.
A little progress over the weekend was the center bearing/slip ring mount or whatever you want to call it. There will be a hollow "pin" that will poke down through the machinery deck and into the bearing and keep everything centered. At least that's the plan, assuming my machining skills are up to it. We shall see. The other unknown is if this little slip ring is up to running mini-servos for the tracks. If it gets fried I might have to build one.