That totally sounds like something I would do for fun when I was younger and had less money. In those days, all my computers were hand built by me, often using spare parts from computers people didn't want. I didn't work much with laptops though. It's a bit trickier, but with the right tools and with plenty of time watching YouTube videos, you can do almost anything nowadays, and save a bundle. Also, eBay is a good source of parts, tools and expired equipment. Chromebooks are creating huge amounts of e-waste because of expiration, so reclaiming and renewing them is something I consider very ethical.