I just finished rebuilding my old Polygon Metro. I was able to stifle the urge to put drop bars back on, but my resolve not to add gratuitous titanium bits lasted 2 metric seconds.
I have 7 of 9 speeds on this modified 112mm rear hub. Wheels are 305. I still need to fold it up for the money shot.
Searching for Mitutoyo and bicycles a bit. It doesn't seem they ever made anything else but the folder, or should I say slider? They do make a spoke tension meter though.