My solution is based on 12.48 inch Magic Ink Calendar:

https://github.com/speedyg0nz/MagInkCal

A 12.48 Waveshare eink display costs $175. Sadly haven't gotten it to work with the Raspi Zero and therefore can't use it battery-powered. Got an ugly cord right now. Running power to the right place through the walls is definitely dedication!

You can run rust on kindles, so you don't need a separate webserver. You can fetch stuff and render the image directly on the kindle. Second hand kindles can be very cheap.

https://github.com/benjajaja/kindle-bueno

However, I would now go for some ~100€ e-ink that is built for hacking.

We do this with a raspberry pi and a decent lcd screen in a picture frame in our kitchen. I like the idea of e-ink but there isn’t a reason to go that route if you want to see everyone’s calendar color-coded while also saving a few bucks.

Love the artistry and dedication in this effort - getting something just right for your own tastes and honing it over time can be really fulfilling.

The cost differential between ePaper displays and the comparatively cheap jumbo tablets will offset higher current consumption for a good long while: https://www.aliexpress.us/item/3256808694032679.html

A project, ZerryBit, are working to do something similar - albeit on a far smaller scale physically than what you’ve done here. Might be of interest to OP or others though - further info at https://zerrybit.com/en-us (I have no link to them bar placing an advance order)

The developer recently had a home tour where you can see this software in use

https://www.youtube.com/watch?v=Wkzg8sNkm8Y

I love the idea of putting this under portrait lighting rather than using a backlight.

A video demo of this e-ink frame is shown in this video: https://youtu.be/Wkzg8sNkm8Y

We use a family paper calendar and I use my watch to check the weather and reminders. Still allows my phone to live in a box at home.

This is really awesome! Dream home project for me as well, but can't justify the cost of large e-ink displays so far (was shocked at the nearly ~$2k sticker price of that Boox Mira Pro!)