The bike part of the bike car is turning out to be significantly harder than anticipated. After the electric runs, I got the crank installed and the chain on, and took it up the driveway. Chain falls off. Tried again. Chain falls off. It was really hard to pedal (turns out I bought a too big big chainring for the front). Oh, and don't weld 6 dollar chainrings. They fold up like a taco.
So I got a smaller chainring off one of the junk bikes and bolted it on. Easier to pedal, chain falls off. By this time I notice that the shaft outside of the bike is really bent. Ok, it's going to need some support outside of the chainring. Order another bearing, wait a few days.
Got that bearing on tonight, take the back derailleur off (it so does not need any gears other than "low"). Take it up the driveway. Chain does not fall off! Crank breaks at a weld. Arrgh. Now I need to go through and solidify the crank. And probably get a yet-smaller chainring.