I think your idea of a FoD "system" layout is such a great concept. As the Americans, and indeed the Peter Denny's of this country understood, Railways convey goods and people from place to place. The "British" style, of focus on one place can be superb, but all too often loses that sense of purpose which moving items from A to B gives. This is where the modular groups like Freemo score, with their operations based set ups. Combining that with your undoubted scenic skills sounds like a winner to me.