Some MMO games I've played that had Guilds and other things that served essentially the same purpose as an FC here had something like a trophy room in their Guild hall or meeting place that would display things the guild accomplished. This would be an interesting thing here. Though I think the only way it could be implemented would be as an entry on the door in the FC house that leads to the crafting room and private chambers. I can't really think of a worthwhile way otherwise that doesn't make it seem like a penalty to an FC if they do not have a large plot with a mansion.