I've attached a color coded picture so you can see discern the 1 3/8" (yellow) and 1 3/4" sections (pink). The rest is pretty well labeled. Not all sections link up in the SCARM software I used but they connected just fine on my table.
I actually wound up not going with this set-up. My daughter wanted an elevated section instead of sidings so I went with the second layout which uses the new O31 curves for the upper return loop. Both plans are nice because they allow the trains to change direction so you're not just watching it go in a clockwise oval over and over and over again. The elevated loop plan I built is also nice because it only requires to remote switches. The remaining two are manual - one is right at the front of the layout and the one on the elevated loop is on a return loop so it really doesn't matter what direction it's switched to.
