Estes BOSS Kit #7316, Build, Part 12, Upper Window Gluing

The marking guide was rolled around the tube and the circles marked with a pencil.

The paint was carefully scraped off inside the marked circles. The glue will stick better to a rough bare tube. 

Before gluing on the windows, 

form the disks into a curve to fit the body tube. Press the sides around a 1/4" dowel or the back of a X-Acto knife handle.

It's hard to see in the picture but there is a curve in the right side picture.

After the first window is glued on, lay a strip of tape down the tube to align the bottoms of the remaining dots.

Repeat on the other side.