After 1,977 days, my "unintentional project" is no longer a project, and no longer mine. I was able to send it off with a new owner tonight as a one-kick starter that pulls hard and runs smoothly. It's fully functional, safe, reasonably attractive, and upgraded to be practically streetable, day or night. I practiced a lot of fabrication techniques and learned a lot about circuit design, troubleshooting, and how NOT to buy parts.
I rode it enough to recall vividly what it was like in the summer of 1980, at age 17, to suddenly find myself able to go where I wanted, whenever I wanted, without prior coordination or anybody else's say-so. Mission accomplished.
I guess that closes out this thread. What's next? Well, I might finally have a chance to pull my long-dormant Bultakenstein out of the back corner of the garage. Then again, I might not. Right now, I can't say.