Thanks man!
Have you seen Internet in a Box?
Very robust and fully developed, mostly geared towards EDU but it’s a Linux install. Mostly used on the Pi but anything you can put Linux on will work.
https://internet-in-a-box.org/
“Internet in a Box” means it’s basically a local server and other devices can connect via a browser.
27 minute video of description and install. https://www.youtube.com/watch?v=javfG88cZB0
Here’s a demo, en espanol - Mexico