Hi Chris

I have lost about 70mm on y axis, that is to the top of the extra rotary table see arceurotrade part number 130-030-00300, and I lose a bit more as I have fitted a Jacobs chuck in the 2mt taper, all I needed to do was cut some gears, did work well. I will post a picture over the weekend for you...
I don't think it is the best way though! I would prefer to get the 70mm ++ back and use the original table.
Regards
Paul