MNT publishes everything: source code, schematics, complete BOMs, mechanical design files. You could produce one of their laptops, or any part of it, yourself through normal PCB suppliers like JLC and 3d print a case.

Reproducing what they have aside, you can also modify any aspect of it by remixing their designs. The most common example of this has been custom keyboard layouts (ergo, split, etc).

Framework is perhaps well-documented, but it's not open. There are only pinouts, partial schematics and some MCAD stuff published for extension development but no ECAD designs.

Lots of components from third parties, starting with the processors they use (Intel/AMD vs ARM processors).

Framwork is usability and performance first, openness second. MNT is the other way around.