Have seen the Rotunda accessory light mounted in the middle of the "X" brace on the backside of the hood, and the wire running though the actual brace down to the left corner of the hood. It really looks sharp there....and would not really be incorrect as far as I know..
You'd have to chase the wire through a drilled hole in the exact middle of the backside of the hood (Center of the "X" marks the spot!) down through the center of the brace to the lower left corner near the Brake master cylinder where a small hole would be drilled in the lower left corner so the wire could exit out. For the cool, clean "no wire" look...it's worth it..IMHO.. I saw a guy with a '66 who did this to his car at a show, and I was impressed with the result. It really looked like it belonged there, and no wire showing...functional too! Just a suggestion.