Slow car/huge cargo bike for burning man

Hello bicycle weirdo!<br>
<br>
I converted a car to be powered by bicycle. As you can see in the pictures, the engine has been replaced by a bike. The original transmission now has a cassette on it, and it still shifts (1-4, R and 5 are gone). The rest of the car has been stripped down, leaving only the rolling bits, exterior, driver's seat, brakes, and steering. I think it currently weighs about 900lbs. On the flats it's easier to pedal than expected-- we biked it up a (tiny) ~12% h