That thing looks like a lot of fun, as much as I don't get the appeal of racing karts as they are typically built. My issue with racing karts is that the wheels are too damned small, the ground clearance is too low, you don't have enough suspension travel, and there's nothing to cut down wind resistance to help it go faster at higher speeds. They tend to drift instead of handle corners with stability. I do like the fact that it is terrifying, but it is also of limited use off of a race track. For all practical purposes, where could you take this vehicle to reach its top speed without crashing? Can you carve up canyon roads with it? Can you use it in traffic?
I enjoyed watching you do donuts with it. It also takes a LOT of skill to drive these things, so mad respect. I look forward to seeing how this progresses.
That being said, this system has the building blocks that would be appropriate for a DIY microcar. Imagine a 150-200 lb vehicle with this kind of EV drive setup, made to be road legal. 16" DOT wheels all around, hydraulic disc brakes, independent suspension with at least 2" travel on all wheels, and an aerodynamically slippery body that produces just enough downforce to avoid lift but not enough to slow the car down. You only need room for one, and with a roll cage and safety harness, its safety could be "adequate". Get the aerodynamics right, and you'd only need 20-30 Wh/mile to cruise highway speeds and would be able to hold 100 mph on like 5 horsepower. Except you'll have 40 horsepower or more shoved in it, and with the hub motors now available, the possibility of AWD is opened up too.