1. I've ordered a 9 volt battery connector and a rechargeable 9 volt battery, so the Arduino will not need to have a wall plug.

2. Turns out my solar panel phone charger will work with the Raspberry Pi, so that's covered!

3. I'm looking into a power bank for the screen; I need one with a 12 volt output, as well as a USB to DC adapter cable.

UPDATE: Third party licensing information is now linked on the project pages. Yes, I realize I wrote "Part" on the page, but I couldn't find how to fix it.