Bah. I think the holy grail of controls is the lunar lander roller
I've seen full Lunar Lander CP's go unsold on ebay a couple times over the last couple years.
What about a Moon War roller?
That looks alot like the proto Major Havoc roller I built using the guts from a Wico Command Control trackball, and a 3" caster I picked up at Home Depot.
I stuffed the shaft through the caster, put the encoder wheel on the end, and ran it through one of Oscar's optic cards.
I wanted to see if the roller HAD to have three axles, or if a center-only version would work.
It worked great, but I didn't like the appearance of the wheel itself, so I never mounted it properly.