When I can, I'll build one for my great aunt. I also want to build both of us laptops with i7 processors.

I don't build it from scratch. I usually buy the casing. It comes with everything but the hard drive (and sometimes the charger).
Then I buy a hard drive, an OS, and sometimes a charger. Those are the necessities needed to run a laptop.

I'll post a picture of the one I built last year.