RAID5 in an Apple Network Server

Introduction :
In a previous article about a RAID PCI card I described the installation of a 4 HD RAID volume in a PMG4. At that time, all of the HDs were lying on a shelf as I could not find a proper case for them. In today's article, I describe how to prepare such a case, and how to connect a doubled power unit (PSU).
This article shows how one can easily recycle an old Apple Network Server as a perfect case to install a RAID volume.