The proximity based lockdown is interesting but won't prevent the likely scenario of being grabbed while you are using the computer. Silkroad is a famous incident, but I think its the only option in any scenerio where the attacker knows you are using an encrypted disk.

I'm curious about your supply chain risk mitigation. Given that the project is open source, can you publish a list of all of your suppliers and the country of production?

Great work overall, looks like a nice design.