I'm in the process of producing 4U cases with the help of a local factory.
6 GPU, exhaust fans, 2 PSU, Mobo small format (like the H81 PRO BTC)
Here are the prototype specs :
Initial version with 5 GPUs and 2 PSU on the front
I should have the second prototype (6 GPU, rear PSU + option dual PSU) soon.
Please tell me if you could be interested.
Only problem is I'm in Europe, so shipping could be a problem.
Eric