Sunny day today, so I could do a quick test of the sunny screen cutout. Here it is with sun shining on the right part of the screen, and the left part of the screen shaded. So far, it looks like it may work! I'll try modding the second laptop that runs the APM ground station software.
Here's what the back side looks like. I've got it taped up, but I'll put a piece of clear plexiglass or somesuch on the final version.