Few modifications.  Plan is to have IStoryService in linking project.  IStory goes to linking too.  Repositories stay in core.  There will be IStory, ILegacyStory, and ILinkable.  PlsStories will implement IStory and ILegacyStory, whereas RtvStories will implement IStory and ILinkable.  Website will need reference to linking project in order to use StoryService.