We have seen many rigs, have we had enough!? Here I present another unique rig, more hexagonal than circular. Made it with PVC pipes painted black and composite aluminum and can have 6 cards, though currently it has 5.
Here is the hardware:
GIGABYTE H110-D3S x1
EVGA 1200W 80+ Platinum x1
EVGA 1000W 80+ Platinum x1
AMD Vega Frontier Edition Air x5(+1)
HyperX DDR4 2400 MHz 4GB x2
Intel SATA 160 GB SSD x1
Intel Skylake PENTIUM G4400 x1
Running a Windows 10 x64 build 1511 (old)!!! Even this version of windows does not make any problems for mining.
I use mainly SRB Miner 1.6.1 but you can get a very close hash-rate with XMR Stack too.
I get a stable CN7 hash-rate of 10.9 KH/s with SRB Miner and 10.85 with XMR-STAK (intensity set to 2048), adding one more Vega FE to make it 6 cards it can surely reach 13.1 KH/s.