bending up some tubing to run the wires in would be trick. running it through the frame is just about bullet-proof, provided they don't find something sharp in there to rub on, and you use some nice rubber grommets. small wire straps would work well.. drill and tap holes in the frame and scew in the straps. Zip ties are easy, and will last just about forever. Spiral wrap adds some additional protection to the bundle, and is cheap. You can get it in about any color you want.