I also really like the idea and I admire the effort put in developing it but no matter how physically secure it is, it is useless if the chip inside is already compromised.
One problem I also noticed when first reading the campaign details is that if you can't access the inside of the computer but have physically access to the room that it is into, one could just hide a camera behind it and record the monitor or the keyboard, or everything at once, which makes all this physical security useless.
Anyway it is great to see effort to improve physical security and if it's open or libre enough, it could be used as a basis for other projects