Side view of the OTA. Oval cutout ribbing on the bottom of the rings can be see just below the OTA tube.

An electronic focuser was required, the motor/drive of which is shown in this view.

OTA is shown in the rings at the correct center of gravity for the OTA (based on all weights, including the dew shield and ccd camera).
 
 

 
 

OTA only

OTA with rings

Rings only