Here are a couple of pictures of a computer I made. It's HAL from 2001 made from an old crappy computer case, some aluminium and an old camera lens. It even speaks when you boot it up. Currently running WinXP but soon to be Linux. (when I find the time)
Cutting the Aluminium with a dremel was very noisy and as I don't have a workshop, only the balcony to my apartment, stupidly unsafe too. I solved the noise issue (neighbours in Japan complain if you fart too loud) by timing my cutting to be during lunchtime on weekdays, when I'm home, at which time recently we have had construction workers sandblasting the building across the road. Worked a treat. No complaints and no lost fingers.