I was in Missouri yesterday and bought another sheet. Now I can redo the leftmost module (the yard) and will have plenty to use as base material for terrain experiments. (I might put a hill on the corner module with a cut for the track to pass through.)
Another variant: I add one more track on the right side of the yard, and it will be used as a home for the locomotives/switchers when they are not working. Is this better or worse than the previous plan?
Joplin, eh? Even from Muskogee, that would be a bit of a stretch. I may wind up using two 1" thick pieces of blue foam from our local Lowe's (and, since Mrs. Friscobob works there, she has the 10% discount). I'm guessing that I may live too far south to get 2" foam, but there's always a work-around.......