The Minmatar Maelstrom battleship from Eve Online. This didn't really need a lot of modification, mainly only around the "sail" parts toward the rear where they were non-manifold flat faces. These were tidied up, and whole sections rebuilt in order to make them work properly.
EDIT: Added the Typhoon and Tempest to this set to make a full set.
All intellectual property belongs to CCP Games. Any use of this product for personal financial or commercial game is illegal under copyright law, and against the EULA for Eve Online.