Attached is the final positioning observations for BSC8.  Thanks to Scott David & Bubba.

The numbers in the top plan view show the measurements from the ends of the Support Tubes to the Chamber "D" nozzle.  Mirror numbers indicate a balanced location.  Accuracy is typically 1/32".  This system is in very good initial position.

The lower numbers are the vertical positions of the Support Tube.  We purposely leave these a several mils high to allow for sinking when the ISI is added.

To understand why the design elevation is 1060.5mm, see T1100194.