Yes I know, this is the fab section. I figured anything you use a grinder on is fair game
I'm running pfSense as my firewall and network routing device. It's currently running on an old IBM desktop but that's taking up too much room. I've recently put a bunch of my gear into a little comms 19" rack. It's only 250 deep though so a lot of PC stuff won't fit in there, so I decided to make my own.
Case is a gutted old V.35 inline probe. I kept the power supply as it was still good, it feeds 12v to a 120w Pico PSU. Motherboard is a little ITX Intel Atom with 1gb RAM. HDD is a 1gb IDE flash drive.



Motherboard is mounted to the case with nuserts. I used a 5" grinder and a flap disk to bring them down to the right height

I had to order some proper heat sinks and fans as well as the PCI adapter. This lets me plug 2 NICs into the single PCI slot of the mobo. I'm just running el cheapo TP-Link NICs



PCI adapter is mounted to fabricated brackets pop riveted to the case, adapter is pop riveted to the brackets

Since this thing will be on 24/7 the Atom board is a good choice as it has low power consumption. It has 3 NICs all up, one will connect to my ethernet ADSL modem, the other two will be 801.q trunks to my managed switch. All gigabit stuff so I should get some decent throughput.