The main idea was that a mini-itx case is far too much expensive, and is most often made for media centers with a slim optical drive and a 2.5" hard drive. What I wanted is a server, with one or two 3.5" hard drives, and no optical drive. I also wanted an efficient power supply, which is hard to find, so I just considered the lower bound to be not an ATX PSU which is very inefficient with such small loads (around 30W). The mainboard is a Jetway J7F4K1G2E, with a C7 Eden 1.2GHz fanless CPU and two gigabit ethernet NICs. The PSU is a Morex 60W Power Kit No. PDB060R.
I've made the case as small as possible, with an steel plate for the motherboard, PSU and two 3"1/2 hard drives support and an aluminium plate for the closing panel and the fan support. The air flow is designed to cool efficiently everything: the heatskins of the motherboard (which really needs it, despite what the vendor says), the hard drives (one for now), the RAM, the PSU, and even chips of the motherboard.
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