[Nemo123]

That's what I'm doing. Instead of buying a kit I've bought all the parts. A 600w brush motor, a #25 chain, a #25h drive sprocket, a freewheel for the chainset, 80 186650 li-on batteries, a 36v battery management system, a 36v battery charger for lithium batteries, a motor controller, a throttle, a freewheel chainset, and various connectors and sundry nuts and bolts. I'll post a picture when I'm I'm finished. I reckon I'm saving a hundred dollars or two doing it this way. Mainly because the batteries are so expensive, and I'd have to pay VAT if I bought a complete kit.