This documentary never happened and so the project sits around collecting dust, but it was a fun weekend.
(Note, this isn't quite LoRaWAN or Meshtastic, which implies you want to uplink this to the Internet, but the idea is that off-the-grid radio links are still useful.)
They are, you might want to link up with your local amateur radio group ("hams" for whatever reason in the US) though, they specialize in such stuff.
My second use case is I build airsoft and paintball digital flags and scoring boxes using LED strips and microcontrollers. I plan to test and use LoRa radios for them to communicate through the forest and relay game status or even allow refs to control things for dynamic gameplay.
Even just a few miles up the OHV trail near my house has no service anymore. Pretty much none of the mountain area around the valley does.
That said I carry a garmin inreach, because while stuff like meshtastic is handy to link groups together and use for fun and utility, for safety you want something that works anywhere.