My ideas for what they are worth
Regarding screens, I have a screened window in each side door of the shell but they are too small to be effective in allowing air flow. I am now in the process of making screens that will adhere to the shell with magnets that are sewn into the screen. When not in use, they will be stored in the camper shell. I realize that with an aluminum shell that won't be possible. I have two side doors and the tailgate on my shell so it should allow for plenty of ventilation and with the doors up, they keep the rain from coming in.
Regarding lighting; I have pondered that question for a bit and I came up with a magnet light that I can plug into one of my accessory plug-ins in the back. The light has a long cord so I can direct the light to where ever I need it. It doesn't work for a back up light but it is great for when I need to set up camp and the sun is already down. I too want a better back up light and I think that I am going to go with a single square LED mounted to the top of my rear bumper. I plan to wire it both to the reverse light and through a toggle switch.
I know that my ideas may not work for the above questions but I thought I would throw them out there for you. Let us know what you have come up with, eh?
Mikey