Jaegers 6" f/10 "GJD" OTA Construction - Main Tube (ProtoStar FlockBoard rerolled for fitting)
 

ProtoStar FlockBoard Material rerolled for fitting and trimming in Main Tube - 3 (Click to see an enlarged image.)

 
To determine the actual size of the ProtoStar FlockBoard, I will do so by rerolling sheet of flocking material securing with rubber bands followed by unfurling it inside of the main tube. Then, I can make mark where the cuts need to be made to trim it to proper size.