Hey Skysurfer,
This thread deals with a photo tripod. But I started another thread where I did the same thing with an AZ3 mount that has slow motion controls.
You'll find it here..
Thing is also with this sort of set up is mainly low power is being used, so Earth's rotation isn't such a problem. But I do understand some type of motion control is desireable at high power. You may find the way I modified the AZ3 very useful then.
Mental.