I thought I'd add to this thread so as to give RandyM the proper credit for giving me the idea for my display.
All of the parts except the globe ring and mounting plate are pretty much available from any hardware store.
I used 24" nipples to space the globes, and it allowed me to put each system on 16" centers. Lots of other nipples
involved as well. Had to use a macro lens on the camera to get a picture of the entire wall in, which distorts
things a little --- the globes are a safe distance from the pool table.