Here, Here
While building your own white-box desktop PC has a long history, doing something similar for a laptop was a problem. Namely, the laptop manufacturers made sure you couldn't do it by keeping things proprietary to the extent possible.
The first kink in the armor, however, may be the line of white-box laptops by Asus. Legit Reviews has an article on their building a laptop based on this line (see the article here).