Why wouldn’t you just get seagate exos 14tb drives for $270? Save $40 and get an extra 2 TB per drive.
https://www.amazon.com/Seagate-3-5-Inch-Internal-Enterprise-ST14000NM001G/dp/B07T63FDJQ
In case anyone is wondering, here's what my current build plans look like. I still need to buy fans and some Molex to fan 4pin power cables, but I'm holding off on those until I get the case.
Fractal 804 case ($142.91) https://www.amazon.com/gp/product/B00K6OVG0I
(10) Seagate Exos 14 TB drive ($2090) https://www.amazon.com/gp/product/B07T63FDJQ
Intel RAID Expander Card (RES2SV240) ($155) https://www.amazon.com/dp/B0042NLUVE
Power Supply ($94.50) https://www.amazon.com/gp/product/B08PDV45F8
(3) Mini SAS to SATA Cable ($41.97) https://www.amazon.com/gp/product/B012BPLYJC
Sata power cable splitters ($6.99) https://www.amazon.com/gp/product/B07T356R21
Sata 90o angle adapter ($6) https://www.amazon.com/gp/product/B07P5N714P
Total cost: $2442.87