I had to remove the fan, part of the fan grill and cut the release lever for the 3.5" bay in order to install my dual bay hdd enclosure. I plan on cutting an opening in the top to install the aux cooling fan.
Love this slim micro case, one of the best ones I've ever worked with. Case doesn't feel as cheaply put together as others in this price range either. It even has four USB ports in the front.