Thanks guys for the welcome and feedback.
The curve/arc should be ok, my mentors (my boss, and workmate) for this project seem to think the geometry of this mount should be similar to that of a normal EQ mount. Don't have much more to go on but, Fahims' comments are encouraging.
Your correct with its movement Fahim, two 12.5mm self-centering bearings keep it smooth with the expected 30 odd kgs. Yeah, 30 degrees doesn't sound like much but......! Need to wait for the base before going further with how i will mount it. It will be a frame thought, just for ease.
Learning lots going back in old threads, Great site.
George.