Here is the hardware source code for the Librem 5 Dev Kit under the GPL 3.0:
You can open the .sch files using KiCAD. It looks like to me that everything is there except for the .gbr (Gerber), .drl (drill holes) and .pos (position files for pick and place machines). The Purism Social Purpose Corporation filing says that the company will release all the software source code and hardware schematics that the company creates, so Purism should also release the source files for the final Librem 5.
See this article about how Purism designed the Librem 5 using 100% free software:
I didn’t think that it was possible to only use free software in hardware design, so hats off to Purism for doing it. (When I worked in a hardware design company in the late 1990s, I remember the guys who worked on hardware telling me that the free software tools were never going to be good enough for designing hardware, so times have changed a lot.)
Todd Weaver said in this interview that Purism won’t release its Gerber files until the company has recovered its development costs on the Librem 5, which he estimated would be within 3-5 years.
Unfortunately, Intel won’t let anyone publish their modifications to the Intel reference designs which are copyright encumbered. It would be awesome if someone would sit down and try to recreate the schematics for the Librem 13 and 15 by looking at the motherboards. According to this post, the Librem 15 v3 is a modified Clevo U953. As far as I can tell, everyone who makes Linux x86 laptops (System76, Tuxedo Computers, Slimbook, Purism, Station-X) uses Clevo, but Purism is the only one (that I have heard of) which has modified the Clevo motherboard and case.
The one company that didn’t go the x86 route was Pine64 in creating its PineBook, which is probably why Pine64 was able to publish its schematics in PDF (but no free/open source license), whereas none of the others have. I assume that Rockchip doesn’t have the same restrictions on publishing modifications to their reference designs as Intel.
I really hope that Purism will make an i.MX 8 laptop after this, so we can finally have a free/open hardware laptop.