Steve,
Something else to be aware of with the O60 switchesis the 1 3/8" half roadbed straight sections that come with them and the non removable straight within the curve of the switch. If placing these switches in a curve, someone would also need to account for the 1 3/8 to 2 3/4 straight section added within the curve. If you look closely at he image below there is a O60 curve with 2x 1 3/8" straight sections attached on the left, exactly overlaying the geometry of the O60 switch below it.