ATM one MB with 3 cards, but using win7 and can't get more to cards detected even though MB has 6 slots. I was going to try Linux and see if I can get 6 cards on the MB running which would be 12 GPU since each card is 2 GPU's. ATM using EVGA 1600 Plat PSU for 3 cards, if I can get more then 3 on the MB, then I would use 2 x 1300 EVGA or 2 x 1600 EVGA. If all 6 cards work on the MB, then prob use 3 X 1300 EVGA and use the 1600 on another rig. How much would a custom setup run me?

A couple of clients were nice enough to send me some pics of there rigs.

Yes, we ship worldwide.  You probably want a full-blown test bench: http://spotswoodcomputercases.com/wp/?page_id=531 

I'm still building custom miners (ignore the cards pictured here, they are only being used to verify fitment).  







This one was built specifically for SAPPHIRE Technology's GPUs with "NITRO Free Flow" airflow.

I'd buy a rig to support 4x 7950 and 1x 295x2, if you took bitcoin.

I would like to possibly order the 7 GPU model, but cannot find it on your site.

Might've misread your post but your including two PSUs? If so what brand and wattage

New models coming this week! All models can handle 7-8 GPUs and are stackable.

One PSU version, 24-inches wide (same footprint as the old "Wide Open-frame Mining Tray (one PSU)"):





Two PSU version, 26-inches wide:

that frame height and width 25 mm ?

New optional GPU-only tier for our two PSU mining tray:



This option along with a dual PSU tray is the perfect frame for the  Biostar TB250-BTC PRO or ASrock H110 Pro BTC+ motherboards.







$95 (for the optional GPU-tier).  PayPal only.  Shipping from Washington, US.

In order to mount 12/13 GPUs, along with the rest of a rig, also requires purchasing a standard dual PSU tray.