Inside the CM Storm Enforcer, things are pretty standard. The motherboard tray dominates the internals, whereas to the right are the various bays for 5.25-inch, 3.5-inch, and as is the norm these days, 2.5-inch drives.
The interesting thing, however, is that the 3.5-inch drive bays are divided into two parts, with the top part being removable and rotatable. By default, the drive bays lie perpendicular to the motherboard, and if you fancy, you can rotate it such that it lies parallel. You could also remove the top part of the drive cage completely and fit it instead with a smaller one meant for 2.5-inch drives. This is especially handy if you intend to run your system off SSDs.
This is also helpful if you intend to install a large 12-inch graphics cards (like the massive Radeon HD 6990) because as it is, the casing isn’t quite big enough for cards longer than 10.5 inches. To make space, the top part of the 3.5-inch drive bay needs to be removed. Be warned though, removing the top half of the drive bays is a rather tedious affair because you’ll need to remove quite a bit of screws.
Fortunately, if you are happy with the default orientation of the drive cage, the rest of the installation is a straightforward affair. Cooler Master casings have always been logical and easy to install and the Enforcer is no different.