There is a large vent hole at the back. It lacks a dust filter, either:

The front panel is designed perfectly, too:

It looks nice and is made from a noble material, a 5mm bent sheet of aluminum. The front-panel components are placed in a proper way, too.

Most of the front panel is occupied by two faceplates of the optical drive bays:

They are shaped so queerly (the faceplate is much larger than is necessary for the drive) because it is possible to install a 7” display from Thermaltake into the top bay. This display (the serial number A2413-01) is already selling. The faceplate of the second bay is shaped in the same way for the sake of symmetry, I guess. The faceplates are made from plastic with thin plates of aluminum glued to it.

This is done to maintain the uniform style of the front panel. Plastic, even if painted appropriately, won’t be the same as a milled aluminum plate. There is one 3.5” bay to the left of the 5.25” ones.

This is just the right place for a universal card-reader.