Just starting a branch where I might check out the bugs with loading building definitions as needed. Problem is the building definition, when it loads, often creates stuff that it then later decides to call Destroy on. But Destroy takes one frame. So if you load definitions as needed instead of on startup, the extra stuff is still there when the actual building is spawned and you get extra meshes like bonus floors. Need to either delay things somehow, or make sure all the destroys also set the parent to null to kick stuff out of the heirarchy, or set some sort of invalidating flag.