420: PM'd!
More info about the custom cases I had typed originally before posting:
I have a case that can hold four motherboards, with a variable amount of cards per motherboard (one wide mount area), you could do like 6 or 7 cards per motherboard, probably.
There are two of these chassis' that we have built, one of them can only hold two boards, and I have two Asrock boards on it, one has 5 cards the other has 4. One has a Phenom II and the other has an Athlon II. It has a 1400w and a 1000w PSU (both single rail).
The other case is the one that holds four boards. I have the
MSI Big Bang Marshal B3 for motherboards, the "only" board that has eight full size PCIe slots, plus they are LGA 1155 so they are very current technology. I have two of these boards. One of them is in the box as a spare, I had planned on putting 8 more cards in that rig (8 cards per side in that case gives tons of room between them so they stay breezy. You can't fit four MSI Big Bang Marshal B3's in that case, since it's bigger than ATX spec, you can only fit one per side. Right now I have two Corsair HX850s running the Big Bang and 8x 5870s. I have two i7 2600k's available but I'd rather sell you two i3's with it and sell the i7's on eBay, depends on the price we agree on.
These cases are very valuable, and I was considering them *included* in the prices of the rigs, so if you bought the whole lot or one complete rig (mobos/gpus/cards) the case would be added at no charge, I'm hesitant to post pictures of the genius design of our cases because we were planning on making them available for purchase. They are sort of our "prototypes" but our final version would be made out of aluminum. They are awesome. The one that has 2 boards in it right now is 17" wide, 26" deep, and 12" tall, all the video cards sit horizontally so there is a full 26" to mount the video cards for both boards. The dimensions were chosen becuase it's the same footprint as a big rack server, except it's a rack mining rig. The Big Bang case is too wide to possibly fit in a rack, but it can hold more and is great for it's purpose.
If I sell off all the cards and I'm left with mobo/cpus/psus and the cases, then they make the ultimate mining setup if you have a bunch of cards and they need a home, this is a palace.