How do you keep all of those densely packed HDDs cool?
I see the four fans sending hot air from the interior over 3 layers of drives and out the rear. The fans do appear hefty, but I am doubtful they are up to the task if the racks are full.
There are many similar chassis from SuperMicro brand. They pack high density at the expense of high quality hardware. Those depicted fans are industrial grade units that push a lot of air (and must be pretty loud).