Im on both the pedelecs and emtb forums and for building your own I'd recommend you join pedelecs site. They certainly have more experience in this area, especially to do with the electrics and settings, whereas the emtb forum is more like full fat suss Emtb for offroaders.Building one Andy though it'll be a Model T in comparison to your splendid bit of kit. I think it's one clever bit will be to use unmodified power tool batteries as it's power source as they are way cheaper the bike battery packs. Like you my unassisted cycling days have significantly declined.
It really is a great sensation, and one of surprise, relief and elation.I have a Fiido D1. Just over 2 years old and over a couple of thousand miles on it. Needed the odd bit of fettling and a new charger. Have also replaced the crap brakes that came with it. Perfect for recovering from surgery about 2 years ago. I was back on the bike about a week and a half after coming home from hospital and riding 2-3 miles (bear in mind I couldn't walk more than 100 yards at the time).
Recently converted an old Whyte hardtail to electric using the Tongsheng kit. Conversion took just over an hour and cost around £425. Logged a couple of hundred of miles on it in a shade over as many weeks.
Both are a boon here in N. Wales, especially as we are a household without a car and all facilties are at least 4 miles away. Just yesterday, I thought nothing of popping into town to visit the local library and then over to another village to pick up the missus' prescription - about a 15 mile round trip with about a 1/3 of it up steep hills. I now wish I'd added an electric bike to the stable years ago. Great for tuning the ride - you can turn the motor off and push a bit harder going out and let the bike take the strain coming back loaded up with shopping or late at night after teaching.
The battery pack probably contains many standard size cells, 18650 for example. Once it's dead, get it re-celled.The battery after 20 years probably will not hold the energy properly and will be difficult to find the same to fit in the frame.
Not me. But a classic ... I don´t know. It is Like a mechanical watch vs smart watch. A 1957 Speedmaster is a masterpiece. A 2014 smart watch is ... garbage.
Absolutely it's an opening up of new skills and businesses to cope with failing motors or recelling batteries, There are many people cannot even fix a puncture let along strip and service hydraulic brakes or forks or suspension units.I do think there is a potential short term problem with the longevity of some ebikes and maintenance of what are sometimes non user serviceable motors etc. But if the market is there, solutions will follow.