I think I'll start by adding a photo of my pride and joy.  This started out as a 20" F5 Star Splitter dob.  See my Servo-ization page for the intimate details of that venture.
It is now a fully automated SiTech controlled GOTO machine.
Seems the original photo is too big and the next size i can insert is this small...  will update shortly.

More photos:
Note the fan in the mirror box to clear the boundary layer from the mirror surface.