Here's the wiper motor installed.
I used 5/16" Bundy tube bought from my local Hydraulic hose supply at about $6 per meter.
To do a tidy job you will need a flaring tool for the bundy tube. Flaring the ends of the tube locks the tube into the wheel boxes rather than just relying on the clamping force to hold it in place. The flared end also makes a nice transition for the cable as it moves back and forth (No edges for it to catch against).
Keep any bends to a wide radius. With tight radius bends the motor will have trouble pushing the cable through. You can carefully bend the tube by hand without a bender but make sure you check it hasn't distorted the tube too much and the cable still runs freely through it.
All I have to do now is source a cam with the right degrees and a plug to wire up the motor.
Cheers