Comment by jogu

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).