What a cool set up! I don't suppose those boards come up on eBay too often...

I read about those boards when I was researching my options. After scouting out eBay, I figured I'd need to spend hundreds of dollars to get the materials for customizing a vintage freewheel, and then I'd have compatibility to worry about.

With the Shimano stuff, I counted on the various cogs and freewheels being compatible, and it mostly worked.