Dome Top

If you look at pictures from the original screen used R2D2 you will see some detail piece on the very top of the dome.

To recreate this I simply went to my local hardware store, and picked up a "Bi-Fold Door Control." This is just a round piece that would slide onto a rod, that also comes in the kit. Toss the rod to the side, who knows you may need it for something later. I then used super glue and glued in a furniture tack into the center. I cut out a small hole in the top of the dome, and glued in the piece in the center of the round blue trim piece.

Your finished results will vary depending on what materials you use, but this is about the look you're going for. Also you want to make sure to use light weight materials, and something that will take glue well. You want to avoid anything that you would have to use excessive amounts of glue on.