Product Showcase - Interior

 Product Showcase - Interior

And at the backside, there is an upper compartment holding the PSU, two HDD mounts, and some snazzy cable routing features. 

At the top you can mount the power supply, really any length will fit. There's a handy retention clip here as well. The rest of the space can be used for cable management. You get a good 3 cm before you bump into the HDD (which can be repositioned or removed).

The drive spaces are located on the right side of the casing. Two 3.5" drives can be installed behind the mainboard cutout, while up to four 2.5" drives can be mounted further front.  Apart from that, plenty of Velcro and mounting options are included for effective cable management.

Here's what I mean with the lacking HDD cage, there's not a lot of room with a standard ATX PSU to tuck away cables. You can mount six 3.5" devices, though, so you'll gain heaps of 'storage' with the removal of one cage. 

Additionally, at the bottom is the Nexus 9P Fan Hub. If your motherboard does not have enough fan headers or you prefer to eliminate wires, you can connect up to nine PWM fans here. Sufficient power is provided using a SATA power connector.