Below is a display layout that was set up some time in the early 1970s in Branch Brook on Rte 36 in Hazlet, NJ. I did this drawing from memory using RRTrack.
Using O27 track, it fits on a 4x6" board. I don't remember what accessories were placed on the layout, but I do remember being fascinated when I was a kid by the path the train would take, and by the use of two 45 degree crossovers along with the 90 degree one.