On the bottom of the case you can several mounting holes for a few different hard drive configurations (2-3.5 inch drives, 3-2.5 inch drives or 1-3.5 inch drive and 1-2.5 inch drive).
You can also see where the screws have bitten into the finish. The finish on this case is a bit fragile, not taking much at all to scratch.
In this image, you can see the screws for the two 3.5 inch drive installation. Using the rubber washers is HIGHLY recommended to isolate drive noise as there is not much mass in this case to deaden the clicks and whines.
Here, you can see the screws for the three 2.5 inch drive installation.