Removing three screws allows the top panel to come off and exposes the internal drive brackets. These have several more screws holding them in place, four for each bracket to be exact, and must be taken out in order to gain access to the interior. The right bracket holds a standard 5¼" optical drive or other single-slot device, and is the only bay that is externally accessible. The left bracket holds either two 3½" or two 2½" drives, suspended upside down over the power supply. A rubber curtain forms a barrier between the bracket and power supply to prevent hot air coming off a video card from blowing over the rear hard drive position.
Room for two 80mm fans is found above the motherboard I/O opening, although with three 120mm fan intakes I think you'll find these are likely not required. Each of the fans ends in a 3-pin header which can either be run from the motherboard or using the supplied tri-connector adapter to run them directly from a power supply Molex. Front panel cabling for the power and reset switches, as well as power LED, USB and audio In/Out is long enough to reach anywhere within the case. The fan filters are installed on the inside of each fan and attached with screws, which will make taking them off to clean a bit of a hassle. They also doesn't prevent the fans themselves from getting choked with dust.
Let's get some hardware installed in the GD05.