Hiding the wires in engine bay

In a few weeks when the '74 Scamp comes back from paint I want to start hiding the wires in the engine bay. In the searches I've done, I have found that people say run the headlights etc in the fenders. Anyone have pictures or advice on doing this? Also, when relocating the battery to the trunk, how do you run the wires....under the car or in the car?? If underneath, how are they protected.
Thanks