I like to document my wire routing and typically find diagrams of vehicles to use as a template with which to draw the paths freehand. I found a side shot of the Wee pretty easily (though it's not a diagram, rather a photo converted to black and white), but the overhead shot is proving to be very elusive.
Strange request, perhaps, but if anyone has a diagram of this model I'd like to have it.
Stock routing is shown in the service manual. New wiring can typically be run just inside both right and left frame members. The ribbed conduit in this picture is non stock, as is the Rostra cable and P clamp.