An update on bike.
Spent weekend riding on beautiful cycle path along American River
near Sacramento, California. 5 star ride, do it if you have chance. 32 paved miles of flat to rolling hills, no cars, just bikes and walkers.
Happy to say that after 9 months and a few hundred miles I've had zero problems with this bike. No signs of failure in either bamboo poles or hemp/epoxy joints. No creaking or flex in bike joints, only in mine. No splits in bamboo. No trouble with drive train. It's a great bike.
I rode 30 miles on Saturday. Battery is tiny, 14s / 3p of Samsung 20R cells, so 52V and 6Ah, ~300W. Couple years old now, but it has had an easy life. Was very happy with its performance. This isn't exactly scientific data, but the profile I rode was ~10 miles with power coming mostly from me, ~10 miles of me and the battery sharing the load say 50/50 and going 10-15 mph, and ~10 miles of relying on battery only and going 15-20 mph. Of course, any section that was uphill... was battery only. Battery performed like a champ until it cut out at 29.5 miles. First time I'd ever had an LVC cut out by the BMS (I generally baby batteries). It was interesting. One moment the bike has electric power, albeit at slightly lower performance level due to voltage drop, the next moment the system has only leg power. No "hey, I'm about to shut off" message. Just gone. Makes sense.