Ive honestly been looking for the same thing, for the most part it seems actual detail schematics for pcb's are pretty scarce, and the folks who have any are pretty unlikely distribute for free. However that is just what I have seen, I just recently got into the Mechanical Keyboard thing, and have been creeping these forums pretty regularly for ideas and diy inspiration, so its very likely that I am just super wrong. Those are just my two cents, but if you do find anything let me know! that would be awesome!