To keep on with the wonderful cooling, you can mount an additional two 80mm fans in the rear of the GD04. These fans aren't included however, as the 120mm fans in the side panels are not only quieter but also what I think is overkill for a small case like this anyways! The four slot covers are also punched out with large grills, yet another small attention to detail that will help with better airflow and cooling. The power supply mounts flat, with the fan venting out a 120mm grill punched in the bottom of the case. The feet on the GD04 are slightly higher than 1cm, so air should escape fairly easily from the power supply. Above the power supply you'll notice one more slot cover. This is wonderful to use for things like fan controllers and expansion devices that require a slot mount on your case but do not connect directly into a slot on your motherboard.

Inside is fairly simple, as my pictures below illustrate. A mounting location for one 3.5" hard drive is seen on the plate going across the right side of the case. This plate unscrews with four screws and when lifted off allows you to mount the power supply and 3.5" or 2.5" hard drive. The mounting holes for the hard drives all have rubber grommets in them to reduce vibration noise. The 3.5" drive mounts in the lowered bracket plates (seen in the pictures below) and the 2.5" drive mounts directly to the top of this cross plate. Next to that, it's fairly standard stuff inside the GD04.

 
(Click to enlarge)