So... I made my own e-ink tablet...

The result is not as good as I could imagine however it is perfect for its functionnality <3

• The goods :
  • Large screen : 10.3 inches
  • everything I wanted plus :
    • a full USB port which I can use to make my backup, to put some books, etc.
• The bads :
  • a bit thick (but as expected),
  • the battery lasts 6 hours (also expected),
  • the touchscreen was very glossy. I had to put a mate protection,
  • I must turn off the device with physical button because devices like radxa and other raspberry pi consume battery while halted (https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#typical-power-requirements)
  • the sdcard is not accessible (although it is possible te remove it and insert it. it's just it is very hard to have access).

I can share the software parts if someone needs it :)

For the software part :

• • Manjaro arm64 (https://github.com/manjaro-arm/radxa-zero-images/releases)
  • XFCE4 panels : to create and manage big icons,
  • i3 : to use the tiling manager and to close the applications,
  • jgmenu : to make sub-menus, ie rotate the screen, send to other workspace

Three things I never doubt about : the device won't be any cheaper , it won't be as thin and the battery life won't be as long as the industrial prototypes.

Now, what did I use ?

• For the hardware part :
  • a radxa zero,
  • a touchscreen (https://www.aliexpress.com/item/4001166217016.html?spm=a2g0o.order_detail.0.0.33e8f19cQXYw0B),
  • a flat external battery 26800mAh (but I used only the charger part and one li-po part),
  • a e-paper screen (https://www.welectron.com/Waveshare-18436-103inch-e-Paper_1) + the HDMI driver board (directly bought from waveshare)
  • some cables, ribbons, a micro usb expansion and 2 hdmi mini/micro adapters,
  • a 128Go micro-sd card
  • 3D printed parts

• Final dimensions : L 22.2 x l 18.2 x h 1.8