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@lae
17/21 Dingle gives a decent range but I'd rather have a freewheel in the low gear. White Industries double freewheel doesn't have as much range (only 2 teeth difference). It'd be cool if you could find/make an oversize freewheel, machine off the big cog from the dingle, and weld the freewheel over it. Then you'd have fixed/free on the same wheel without having to flip it round.
I looked into getting a White Industries double freewheel on one side and Dingle on the other, but I worked out that with limited sizes available on both, the lowest gear would be fixed rather than freewheel.
My old bike had 52/42 rings and 20/30 sprockets (cut from a freehub cassette) on a freehub wheel, a la Sheldon, giving 70" and a 37" granny gear. However I never really tested it properly (frame had no drilling for a rear brake) and ended up selling the lot. I might do it again on my current beater though.