I ghettoed it. Might work for you.

Since my main nas was using all 6 satas I wanted to expand.

Got a PCIe SAS card, 2 SAS to SATA external cables, each cable goes to 4 satas.

For the disks I got a backplane for 8 disks, a random tower, a cheap PSU and have the sas to SATA cables going from one tower to the other. The PSU is jumped, I still need to get a button for it.

Image