Well, been playing with this 36 bay unit. really great holding 30 hard drives in 1 box now. It's an Isilon (Dell EMC) 36 bay NL400 chassis.. about $300 on Ebay as we speak. Great deal.. except.. it's loud AF. A real jet engine. The 3 central fans are horrible. I've replaced them with some spare 80mm fans, but .. now its causing the drives to overheat. Guessing I need some good high pressure (and silent) 80mm intake fans. I've put my H55 liquid cooler on 1 CPU for testing.. works, but i can't put the top on the unit since there's no space to mount this in a 2U area (the other bottom half is taken by the rear drive bays..
This is the ebay ad: https://www.ebay.ca/itm/Supermicro-36-bay-4U-Server-Storage-Chassis-Extended-ATX-Ethernet-Freenas/202805514541?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
I may mount a 200mm fan on the top of my rack to exhaust the heat. I've ghetto mounted 3x 120mm fans on the front of the unit to draw air into it, helped bring it down by 15 degrees, but still not enough.
Expansion backplane works great with my LSI2008!