In trying to give both cities and castles stables, I have modded building_battle.txt, export_building.txt, export_descr_buildings.txt, copied and renamed the appropiate ui subfolders and the techtree subfolders. To my dismay they still do not show up in the building window. The system.log.txt gives no clue. RTW had afile that tied all this together but I don't see it right now. About the onle things that I have not edited are advice and ancillaries.