You will want to have a "Steampunk" folder with you current steampunk era project in it. When testing that is the location you will want to put it in to test it out. Inside your Steampunk folder you will want o have the following files ... - Steampunk_CIV4ArtDefines_Building.xml - Steampunk_CIV4BuildingClassInfos.xml - Steampunk_CIV4BuildingInfos.xml - Steampunk_CIV4GameText.xml - Steampunk_CIV4ArtDefinesSchema.xml - Steampunk_CIV4BuildingsSchema.xml And then another folder inside the Steampunk folder called "Art". In there you will stick the button/icon you just made. You will want it on so you can test it. You don't need the Municipal_Computer stuff. You can have all your steampunk related era stuff in the same files. Note that "Steampunk" is the era and not your name. If this was Cyberpunk you would be doing that instead.