Tim, my friend from work, cut some dome vinyl for me on his most excellent 24" vinyl cutter. I did the layout in Adobe Illustrator and initially made a paper template to check the fit.
Once I tweaked the layout, Tim did his vinyl magic. He also included some nice guidelines to help aid in aligning the vinyl along the dome bottom.
I cut 1/2" strips for the dome ring. They went on without a hitch and it is difficult to see where the pieces join together.