The creator, Mike, first started with upgrading parts from the Bafang mid drive kit.. By the time he was done only the motor was left (this is not a knock on Bafang, because the Endless Sphere guys are famous for abusing everything to destruction). So he created his own mid drive kit, which really is just the motor, BB, primary and secondary reduction gears and the crank... Two versions, up to 8 kW..lol
http://www.lightningrodev.com/kits/index.html
http://www.lightningrodev.com/kits/index.html