Since the last update: I designed my own DSI→eDP bridge board in EasyEDA to drive the 16″ panel, and it's being fabricated right now. The keyboard/touchpad board is designed too. The NanoPi M6 already boots GNOME with 32GB RAM and NVMe.
I also made my first English video. It tells the whole story, from living in my Civic to the first boot:
https://www.youtube.com/watch?v=uMsT5qT_nD0

Your coffee is literally turning into PCBs. Thank you for sticking with me since the OmniBook days ❤️ Next milestone: bridge board arrives and lights up the screen.

