Inside the Enthoo Primo Continued
Spinning the Primo around, you can see that all of the chassis wiring has been tended to and tied up to the chassis via the Velcro tie straps found all around the back of the motherboard. Since they are pre-routed, of course they all reach where they need to be. In the middle of all that wiring is a six port fan hub, and a place to store a 2.5" drive if you want to. The hardware and paperwork, along with some goodies all come in the box tied into the bottom.
Once the hardware is removed, you can see there are six stands to support even the longest of power supplies. To the left, on the floor, you will find the pump mounting plate, and there is even a hole with a grommet just above it to allow you an easy place to run the tubing from the top of the pump.
On the other side of the ODD bays, Phanteks offers two trays that will support a 2.5" drive. Both of these can be used here, or you can shift one of these to the middle of the motherboard tray.
The six 3.5" bays are set into two racks, and both are completely removable. If you would like, there is a plate that will install here to allow a dual radiator or even just a pair of 120mm fans to be placed here instead.
With the drive bays now out of the chassis, you can also see how easy it would be to install a dual 120mm radiator into the front of this chassis. You can also see that the ventilation in the floor comes all the way up to here to support that larger radiator. Keep in mind, the front and bottom radiator will conflict with each other if trying to max out both spots potential.