I don't know if you've mounted your additional brake/signal lights yet, but one thing you may want to consider is mounting them on the sides similar to where you had them photo-shopped only a bit lower. By doing this they are still visible through the rear door windows if you have the doors open. This is safer for things like stopping on the side of the road i.e. changing a tire. You'll notice them set up this way on a lot of ambulances/rescue trucks.