Hopefully not too much of a necro thread post, but the Fort Knox base has evolved into a full modding project and is now live on Nexus for A20 + Undead Legacy.
https://www.nexusmods.com/7daystodie/mods/4191?tab=description
Plans are in the works to roll out an A21 update soon, which will include a bunch of new and updated models that are themed for the structure and which can also be used in general horde base designs.