I am in the process of putting some bling on my TW. I would like a waterproof USB port and at least 2 toggle switches. Unless I find a simple way, I am going to try and 3D print a mounting box that will go under the indicator light box. 30mm x 43mm x 54mm. Maybe just the box for switches and a waterproof USB screwed to the right side of the box. What is everyone else using for their auxiliary switches?