Blimey
I finally solved the mystery of the steering control short: the motor's chassis is grounded internally. Which is fine until the polarity is reversed (turning left, say, instead of right) at which point it shorts out the whole system. Since my frame is not meant to be grounded in that way all I had to do was isolate the motor by way of a piece of insulating plastic and electric tape.
Having solved that problem I was able to finish wiring the rest of the drive system: it's now ready for beta testing. The steering system works, the brake works (it has both slow-brake and fast-brake now, which works great) and the indicators and kill-switch all work. Tonight, hopefully, I'll drive out to some abandoned parking lot and give it a thorough testing.
Then, tomorrow, I can start the decor (and finish as much as possible before the parade on Saturday).

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