So, I've just set up an original prototype Salsa Fargo (Size L) with flat bars to ride for awhile. Sunny skies this afternoon and an extra hour of sunlight, so I took it out for a short spin overlooking the river.
I've been riding this proto since June. It has gone through several iterations, but none of them has included flat bars. Until now...
I've put the campy 10 drivetrain back on the bike. This time I've pulled my Moonhead Machine Works 10-Speed campy mounts out of their bin.
Moonhead seems to be now defunct. Originally based out of Oconomowoc, Wisconsin, Moonhead manufactured several machined alloy products along with the classic "Trimble" MTB frames.
With a 140mm Ti Titec 0 degree stem I was able to get the fit within 2cm of my MTB fit. This will be close enough for awhile. If I was going to ride the bike with flat bars all the time I'd likely ride at least 1 if not 2 sizes larger.
A report may come in time. Until then, I've got other projects.