I am a CNC Machine Operator for a 3 meter by 1.5 meter sheet at 3mm thick is about $170 You would only use half that for a case.

I am thinking of doing the same as you but main problem is your cards over heating I was thinking of getting the "EVGA X79 Classified" motherboard since it has 3 graphics card slots evenly spreed out a lot of room be twin them.

How much did that setup cost you? I have around 5k to spend and am looking at getting 1 dedicated pc or 2-3 pc's with 3 7950's
What would you guys recommend to do I will be using it just to mine coins.