Well, it's raining again, and it's time to sort out the lighting.
With the insert taped in place, I started by aiming a small LED flashlight from behind the assembly. I needed to sort out the best position of the insert. I found that I had two options to go with, and both had their plus and minuses.
The first was with the insert positioned where the top arrow points to in this image. In this position the side walls come much closer to the hull, and this reduces much of the stray light coming from behind the insert. The drawback seems to be that the main graphic is pushed farther from the window. I then tried the position as noted by the bottom arrow. In this case, much more light streams in from the sides. But, the main graphic comes closer to the window, and the header that I built becomes much more visible. You get a visually tighter feel to it. I went back and forth several times and I ultimately decided that I like option two.
Next... I hooked up an LED light that I purchased. I positioned it here, there, and everywhere. My first impression was that dang it, the light seems very weak. Of course, my reference was skewed because I had just used a hi intensity LED flashlight for the insert deal. That is a bad comparison. None the less--I quickly figured out that one LED is not going to cut it. So... I hooked up another LED and worked on placing them in various locations. After some fumbling around, I found out what works.
What seems to work is by placing 1 LED behind the main graphic, and one LED just above it to illuminate the observation area. The latter causes light to spill over the top and around the insert, and this seems to illuminate the observation area very nicely. Also, if you peer upward towards the top of the bulkhead, you almost get a sense that there is a spotlight up there, or maybe even an emergency light. I thought that it looks pretty cool. With the lower LED, it of course backlights the main graphic. I fine-tuned the positions, and I then marked their locations on the hull for later reference.
Below: Time to make the light assembly.
Below: How it will sit.
Below: The LEDs are taped on. The double sided tape that come with the LED mount is made by 3m. This is strong stuff. I doubt that I could pull them off if I tried. Or at least, I don't think that I could without breaking things.
Bellow: Loosely installed, just for reference.
End of update.