When I was building my 3-box system, I decided to go the wooden case route.

My case doesn't look as good as those linked to, but it does the job.

For $65.00 in materials and about 8 hours of work I can't even say it was worth it, but it was an interesting project.

For those of you who are worried about thermal issues, note that the space for each computer is very small and that I have no case fan. Just a big heat-sink processor fan and the power supply fan. They do run a bit hot, but not that much more then my main PC.

If you do decide to design and build your own case I have a design tip: Avoid putting big red buttons where they can easily be hit with your toe!