That is slick. Been trying to find a good option like this for a separate display other than an old iPad. Can you provide more details on all parts needed and instructions to setup?
Discussion
Display: https://shop.pimoroni.com/products/hyperpixel-4-square?variant=30138251444307
Board: https://www.raspberrypi.com/products/raspberry-pi-zero-w/
Case: https://www.thingiverse.com/thing:4071984
Rest: Micro SD card and adapter for power.
Get a Pi Zero with headers. Or a Zero 2, much faster.
I only printed the front side of the case, I didn't do the usb passthrough.
As for installation: Kiosk mode is fairly easy to google. Works also with mempool.space, which I had for a long time on the left display.
The right one is running https://github.com/mutatrum/sats_clock. It's still unstable, it sometimes loses connection and doesn't properly reconnect to the price feed.