Ok, I need a HO track plan for the area 96" x 112" (8' x 9'4") that will be expandable to 96" x 290" (8' x 24'). I would like an open center, once around at least, maybe double deck, broad curves, #6 for main, # 4 for yds and spurs. Most of my locos are SD's, big GE's, and articulated steamers...