This is really cool! I love pet projects like this. Although, I can't help but wonder why OP didn't put a frame around an ancient Fire tablet or something else with an LCD screen and web browsing out of the box. Seems like it would result in a better experience (color) with much less work and about the same price point.
You’d have to constantly power an LCD display. With an e-ink device you could create something that only needs to be recharged 1-2 times a year, or that is passively charged off your WiFi.
I had no idea this is possible. Is there a name for power-over-wifi?