If you are looking at your time by the hour, they aren't worth messing with. If you have spare time, tinker because you like to and make a few $, I would get them ride-able, I think you would have better luck at selling them. I see them selling to 20 somethings in the city looking for cheep, quirky, retro transportation to get them to the market, grab lunch, etc.
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nine mile skid on a ten mile ride