Look, apparently I'm not the only one on this painful ship of self deprecation and self loathing that makes someone wanna create a mining rig.
The motherboard is a motherboard made basically for mining even though the manufacturer won't admit it. It has 6 PCIe slots that can accept 6 cards on risers.
CPU and RAM are basically as cheap as possible since they just need to exist. No power from them is really necessary at all.
I chose 6 MSI GAMING X cards because the Twin Frozr coolers on these cards is pretty good and means I hardly have to worry about temps. Each one on a modded bios gives me about 23 MH/s for a total of 140 MH/s.
The rig uses about 980W while on load. While writing this Ethereum;s price is $46.46 which means this rig will pull in $259 a month after electricity costs.
The biggest problem I had with this rig was turning off the Driver Signing when I had it loaded on Win 10. Windows had a serious hard time detecting the cards without freezing or crashing constantly. After getting it to work for about a week I decided to push for ethOS. ethOS is much more plug and play and is a much better OS to use on a mining rig. On windows I spend 16 hours in front of the rig trying to get it to work right. On ethOS i spent about an hour.
The open air aluminum case was made from aluminum square stock and connectors from 80/20.
The power supplies are connected together with a PSU bridge which I forgot to mention in the parts list. This is so one power switch can turn on both PSU's.
Why would I do this? Apparently I hate myself. This was, however, a very fun experiment and at this point in time it looks like it may be profitable.