Parts List: https://pcpartpicker.com/list/ThxbYg
Total estimate price: $2900 - $3200 6 x GTX 1060 = 720 watts
$400 x 6 GPUs = 2400 Frame $30 - (https://rb.gy/nxqyue)
Risers x 1 $65 - (https://rb.gy/rlqwmm)
6 pin to 8 pin splitters $30 - (https://rb.gy/9ewjlw)
ATX PSU kit - $160 (https://rb.gy/xjelfs)
PCIe to 4 USB adapter - $24 - (https://rb.gy/in1oc2)