I noticed something Andrew said, Re: Working out chain drive, and I know he was trying to encourage John to keep on keepin' on with his project. However this struck me in terms of the rate of EV adoption.
My Lectra project took 1 1/3 yrs to get to a ridable state. Andrew says his KZ750 took two years. I remember from my days reading the EVDL that it would often take 1+ yrs to convert a car to electric. The three wheeler I have in the driveway has been on my project list for 1 1/2 yrs. And I have another motorcycle where I started the El Chopper ET design 2 1/2 yrs ago. If it's our hobby we only have weekends to work on it. It's hard to make much progress especially since "life" has a way of enticing us to go to the beach or hike in the mountains. I kinda miss doing that.
If the only way to get an EV is by building your own -- very few people are willing to put up with that, and for it to take 2 yrs per vehicle is not scalable. Okay, I've spent a lot of time reading computer industry articles. 'Scalable' means a process or system which can directly translate to a large scale. In this case 'Scalable' would mean something like EV motorcycles or EV cars are a common sight on the road.
I think that now that I've done this Lectra that I could do a motorcycle conversion much quicker. The school of hard knocks, and burnt knuckles, taught me a lot. (It's amazing how quickly crossing wires inside an EV can turn into a vaporized tool and/or a burnt fingertip) But even if I were now capable of converting a motorcycle in a month, that's not scalable.
This points in the direction of regular factory production at larger quantities than an individual could do in their garage. A place where production could be measured in the number of bikes per day rather than the number of months per bike.