I agree. Sputnic would be great at about 4' in diameter. Believe me I have been looking for large round sturdy plastic objects. Here is the joke I have put sputnic on for now.
It is mounted on part of an old aluminum door frame with a paneling tail.
The printer motor has a small nylon gear from the scanner paper feed. The shaft was from the printer paper feed and the large gear was from somewhere in the printer. The 2 bushings were double gears. They are countersunk into the wood blocks and held in with some speaker clips out of an old boombox.
Darn, I have to redo that photo. Anyway, sputnic has a 7/8" hole so I used the rubber rollers that were on the shaft and mounted it with a 2 screw romex connector. It has 6 leds on it in various locations. Now to get it out in the wind, or as it goes, outside waiting for wind for the next few days.
I'll get a better photo of the gear drive today.