Oh yea! That PDF also had a N scale layout plan I used to pore over as a kid. The Central Michigan. Sweet!
By changing the station names to Bay City, Montrose, Flushing and Durand, you could even have a go at modeling the real Central Michigan, which did not yet exist when Gordon Odegard drew the plan.
I think what draws me is a scene with a ship. The first plan I posted has that Walk-In area in HO scale. On a door panel in N scale, I would turn that whole area into a large water feature and either put a tug with barges on it, or a ship of some kind.