Just built a small one myself around a Natex Intel S2600CP, dual E5-2670, 64 GB RAM package. The case is a Corsair Carbide 400C I picked up for $40 as an open box at my local Microcenter. I had to use some "ingenuity" to get the motherboard installed in the case since only 3 hole matched. But it's a nice looking compact case with a full window and good airflow. I'm currently waiting for my USB 3.0 PCI-e x1 card to arrive and am using a USB sound "card" for the time being. The setup is 100% stable, but noisy since the UpdateFRUSDR script hangs and I cannot profile the fan speed.
Used my trusty old Supermicro 665W server PSU I've used for X79 and X99 builds. The PCI-e x16 slot works fine with my mini EVGA GTX 1060 GPU and I can upgrade to a mini GTX 1070. It scores well with 3DMark11 so there is no issue with the slot. I'm using a pair of cheap Cooler Master Hyper 212s for cooling which keeps the CPUs at 55C under 100% load. Here's a lousy photo of the setup installed in the case followed by a naked photo of the case.