You could access schematics, PCB design and BOM file from project source.
The project DTS (device tree) is based on pine64, i update dts file for audio, bluetooth, camera(OV5640) and some power controls. I attached a working armbian build based on this device tree. If you have any questions about project please let me know.
Here is the Armbian 5.10.43 Buster build for this single board computer.