Thanks again, everyone. The comments and suggestions are so helpful.
PRR's comment about Fastrack vs. GG makes me question my choice, and I am not invested in either yet.
Hannibal - could I impose on having your version of my plan back in GG and Ross? If so, could I get an RRT or SCARM (which I would have to learn) version to play around with - it looks like I could eventually get a nice yard at the top of the layout and use the limited spur now there for industry.