Here's a version using all Ross switches. There are 4 cut pieces (labeled) in this version, but that will change as you build. Right now the tracks along the top/bottom are too close to the wall, so adjustments will need to be made along the left grade and both parts of the passing siding.
I'm still not happy with the siding in the upper right because the Ross O42 switch footprint is so much different than the GarGraves O42 switch, but that's something you can decide. That siding is also in the opposite direction from the others, so it will be harder to service unless you run a train in the opposite direction to service it. There also isn't room for 2 buildings, so I'm not sure I wouldn't have just 1 longer siding vs the 2 shorter sidings. I'd also be inclined to delete the curve in the siding in the lower right to get rid of the small S curve there and give a little more separation for buildings.
