I haven't but I have looked into it. You need adequate braking, so probably hydraulic discs (although some say cable discs are more repairable if you have a problem in the back of beyond). An ebike frame is typically stronger and can take a bigger load, with stronger spokes/wheels too. So by the time you factor in the parts required, and the loss of your existing bike to the conversion...it makes more sense to buy an entry level ebike IMHO and save yourself the headache.
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