Inside the Aeolus, Raidmax has given a few variations on the design that we'd expect to see. To allow for relatively uninterrupted airflow from the dual front fans, they've positioned the 3.5" drive bays in a 2x2 rack across the bottom. This means the fans have less objects in the way of their airflow and also that you can use extremely long graphics cards (how many cases have a clear front-to-back opening for a card?). Unfortunately having the drive bays positioned this way doesn't leave much room for deep power supplies. If you're using a power supply with a depth longer than 7.5" then you'll have to remove the left hand drive bay. This is done by removing the four thumbscrews on the bottom of the case.
Drive installation in the 3.5" bays requires a couple screws on each side of the drive to hold it into the plastic bracket, then installation of the bracket back into the case is tool-less. The 5.25" bays have a removable blue plate that you simply twist a knob to lock and unlock. Some screws are included with the Aeolus for mounting your motherboard, slot devices and any any bay devices that may not play nicely with the tool-less mounts (like my fan controller).
To help your power supply breath clean air, especially since it's sitting on the bottom of the case close to your floor, the Aeolus has a removable fan filter on the bottom. Pictured below, this filter easily slides out the back for cleaning.