Very cool but the original board was never designed to go at such speeds. I suspect you'll ruin the wheels fairly quickly, not to mention you might lose control at high speed fairly fast. I'm not a skateboarder myself, but I've moded some bikes and adding speed is the easiest part, making it useful speed is way harder.
Also, I hope the engine can go in reverse or this guy has no breaking power; and as he gets comfortable riding it, sooner or later, a surprise will happen and he will have no choice but jump ship.
Also, I hope the engine can go in reverse or this guy has no breaking power; and as he gets comfortable riding it, sooner or later, a surprise will happen and he will have no choice but jump ship.