system76 does not make their laptops, they do make some of their desktop lines though. System76 however is large enough that they get input into what Clevo designs - they Clevo often changes the hardware internals, but system76 ensures that the new hardware still has linux drivers. (in some cases system76 has shipped a laptop with something announced as not supported on linux, but this is rare and the rest of the features still works, and this is only done for a feature they figure linux users wouldn't use anyway)

System76 has long been working on their own laptop - every few years they make a progress report announcement - but I don't expect to see it anytime soon.