Took some time today to focus on preparing the DC-DC converter for the bicycle.

It has a multitude of inputs and outputs, all relating to the operation of a "standard" electric bicycle. These features include a battery charging port, brake notification in, brake lights out, headlights, key start, battery in, motor out and throttle control:

Taking a peak at the other side it seems to be a standard DC-DC buck converter with a single transistor and a flywheel diode.

Cutting off the functions I don't need:

Sealing up the unit (only power, motor and throttle connections remain):

Electrical tape based water "proofing":

A test run of the motor: