It looks like you're using a Mac; I'm not sure to what degree that changes anything. Anyway, it's a process. If you're not inclined to figure out the SDK, then I suppose you can change the vanilla game files, but just realize that after any game update, you'll need to replicate the changes again. And if you enable any mod that adds units to the game, then these changes will disappear. But I suppose that's the case if you run two different unit mods... I've never done it the "hack" way (so someone correct me if I get something wrong), but... I think that method might have worked if you had put the new art files in Assets/Units/Carrier/ instead, but I think the preferred non-preferred way is: Make a new folder tree in your installation folder under Assets/, (e.g., Assets/Units/Queen_Elizabeth_Class_Carrier/), and put the files in there (you won't need the .blend or the .jpg). Extract civ5artdefines_unitmembers.xml from your fpks, and put it in your Resource/Common/ folder. Replace the line Code: <Granny>Assets/Units/Carrier/Carrier.fxsxml</Granny> with Code: <Granny>Assets/Units/Queen_Elizabeth_Class_Carrier/Queen_Elizabeth_Class_Carrier.fxsxml</Granny> EDIT: I tested this, and it works, though I get the "sunk" ship problem. If your carrier is rotated 90 degrees, you'll need to download this WWII pack <http://forums.civfanatics.com/downloads.php?do=file&id=17443>, then extract the folder [Animations and Effects]/Common/Edited_Animations/, and copy the contents into Resource/Common/Edited_Animations/.