More progress after today. I just drew the jig for the other standard gauge crossover including a dual gauge route. I will build it as one unit. It goes on the right hand end. All the yellow turnouts are already built and most of the On30 track laid in place.
After that I have to extend the left hand module, by 230mm or 9″ ready to lay track on that end. The two dual gauge crossings on the left-hand side will be built in situ.