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Cool! I want to make one when I have the time, I have most of the spare parts for this. I have a 2207 2100KV motor and a few ESC's laying around. I would have to make some minor changes to the wheel for my motor with the taller stator. Have you considered adding a resistor for limiting the current draw on the PS? Brush-less motor driving ESC's can demand a LOT of current, and many people with small-medium fused power supplies will be blowing fuses or burning them out; even at part throttle, they will draw full load and emit a timed PWM signal.

This is entirely dependent on the parts one uses for this build, if they're purpose bought, or just laying around in the workshop.
This design would benefit from some ESC programming as well, with functions like slow start, low timing (if no motor sync issues arise), and the removal of LVC since the application calls for a hard wired PS. Just my thoughts!

Thank you for sharing, can't wait to make one!

Edit: Also, disable phase braking on the ESC, this will prevent turbulent stops.