With a little bit of work, its possible to add mast lighst and navigation lights too. I fitted some in to a freinds Southampton tug only a few weeks ago.
the mast only needs the rear cross braces taking out carefully with a dremel, which then gives you a nice channel to run the wires down in to the cabin, via the slots inside of the funnels [if you carefully slide them off]. Same goes for the nav lights, careful bit of drilling and you can mount some working "led type" nav lights. Run them off a little 9v battery, so wont drain your drive motor either.