Ok you have probably noticed some more stuff going in
This is a VERY small electric assist motor. Its not much larger than a dynamo and weighs just 1.4Kg. For radial spoking (this is a very low powered wheel and its small so inherently strong) I used washers to pack out the counter sunk spoke holes for alternate heads out/heads in as all spoke heads out, looks so much better.
Controller
The small controller fits behind the seat post frame tube and takes input from a pedelec sensor fitted to the crank axle. The motor kicks in and speeds up as you pedal/increase cadence.
Jerry