Earlier quoted context omitted.
This is an interesting option. Is it possible run that bare motherboard attached to a compatible power supply and nothing else? I don't see heat sinks on the first link, or RAM, or storage on either.
1GB ddr3 sodimms are pretty much free/garbage(friends, IT at work) due to being outdated and too small for anything, or $4 on ebay including shipping if you cant be bothered to ask around. Those were just first random links from ebay, you can get better deals if you search harder, for example EU $15 http://allegro.pl/org-sprawna-plyta-glowna-lenovo-x220-core-... whole lower case +wifi +bt +cooling, one usb mechanical…
As an aside, the schematics really take me back to a moment in the late 1980s. Radio Shack sold Tandys and TRS-80s at one point, and I remember an especially thick series of binders full of the system schematics for one (or some) of the computers they sold. I was too young with no money of my own then to buy them, and now I really wish I knew what that was so I could find it on eBay. Little did I know that was the end of an era, and not something I'd see the likes of again until today.