This one https://www.logic-case.com/products/rackmount-chassis/4u/4u-standard-chassis-15-x-35-hdd-sc-415h/ Got the price wrong it was £50, and 15 drive bays, I populate every other one. Temps are about 25 at the moment, but it is sat in the garage, which is always cooler than the house. I think I just run it with the 120mm fans (and CPU and PSU) but quieter ones as the ones that came with it sounded like an aircraft taking off.