xxUNRESTEDxx

I'm trying to make a unique container that the player can make only one of in each of their settlements. Like the way the Artillery support is. Is there a way to do this with a container? I've tried tearing through the Artillery and even mama Murphy's chair in the CK to find a solution, but I'm afraid I'm just too new to modding and prob missed the connection all together. Any insight or help would be much appreciated.