Use case is a off grid Museum self guided tour. One idea is to set them up around a ghost town so people can tune in and hear a bit of its history and stories.

I have successfully used the Raspberry Pi transmitter and solar battery as a proof of concept, and have found kits [0] and parts [1] that can be pieced together. I do well enough to produce a prototype but lack the skills to create something that would stand the test of time.

Where would you all recommend to get something like this created? Also it’s important to me to keep it as open source as possible.

[0] https://learn.adafruit.com/minty-mp3/hardware [1] https://www.adafruit.com/product/1958