Can you please tell me what platforms and architectures this will run on?
Would it be possible to implement customisable layouts?
I would love to see this project running on a Raspberry Pi

Just some useful information that you can ignore

• model 1&2 uses armhf otherwise known as arm32
• model 3,4 and 400 use arm64 otherwise known as aarch64

Both can be built using binutils and GCC but extra steps to do so are needed.

The RaspberryPi foundation do provide detailed documentation and you should be able to generate a bootloader for it. They also provide modules.
The Raspberry Pi will need a pre-installed image meaning that most core files are installed. Setup like hostname, user and bundled-programs can still be decided by the user.

This project looks promising and I can't wait to give it a spin sometime in the future.