its my understanding that there is a project that aims to create an open laptop design. You would just need to built yourself, but all the specs are open.

there were nano-ITX and pico-ITX boards that were actually affordable. I understand they're a niche product, but they'd be far better as a mainstream product for DIY computing projects - possibly even the dawn of true DIY laptops, if some makers did standardised chassis for those form-factors.