Carton 100mm f/13 "MD" OTA Construction - Billet of Aluminum for Rear Cell (Drilling of Holes)
 

With the rear cell's milling complete, Brian drills the holes for mounting it to the main tube.

 
Now, with the billet of T-6061aluminum transformed into the beautifully sculpted rear cell from the design I provided, all that remained was the drilling and tapping of mounting holes for the main tube, dew shield, and front objective cell. Brian did a phenomenal job of facilitating the holes precisely, as well as making the piece look professional.