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Actually, power tools do have "universal" motors, so they do count as 120 V DC motors. Unfortunately, they are built for light weight and small size, not efficiency or quietness.
Your basic plan is OK, but you'll probably change and improve the details after a bit of reading. A nominal 120 V battery is usually made from 10 nominal 12 V batteries; they are only over 13 V when fresh charged. For brakes, you will need regular friction brakes to stop much harder than you can accelerate. Regenerative braking will extend your range a bit if you can use it downhill or for gentle stops. With such low power, you'll want excellent streamlining, and that, with a bit of battery weight, seems to coast forever so it is handy to rig it so that it goes into regenerative braking if you take your foot off the go pedal. That way, you can get used to gentle stops without touching the energy-wasting brake at speed.
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There is no excuse for a land vehicle to weigh more than its average payload.
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