Connecting the throttle and brake has been harder than expected.
The controller expects a 0-5V signal from a potentiometer. Electric throttles that do this sort of this are available, but I am keen to keep the original throttle so that it remains looking as original as possible. I have found a 0-5V pot that I can connect to the original throttle cable.
This has been mounted to the left hand, low-voltage plate with the wires connected through to the controller.
Meanwhile the rear brake has been similarly, complicated, requiring a new cable pulled through and then attached via a bolt with a hole through it to the hydraulic master cylinder.
It does look a little of a mess at the moment, but it does all work!