A standard micro-ATX motherboard fits perfectly in the GD02. There is even room for a slightly wider board with extra mounting points towards the front. With the power supply mounted to the side, the CPU socket is located in the center of the case, with vent holes on both sides and bottom. The floppy drive installs easily with a tool-less slide that locks it in place. Six screws is probably overkill for a hard drive but being that they are mounted in rubber grommets it may help to reduce vibration even more.
The power supply can be mounted with intake fan facing either up or down. If pointed down it will draw air through vents in the bottom of the case. I opted to put it in with fan facing up to hopefully help extract any hot air from inside the case and blow it out the back. The shroud that holds the optical drive also covers the CPU socket and cables coming from the rear of the drive can interfere with the CPU cooler. In fact you probably won't be able to get away with anything larger than a stock heatsink here.
Other than being a little cramped and having to be careful with cable routing to avoid fan blades, things went very smoothly. Let's wrap up with some final thoughts.