@Craftech John,
Back to your original request, I modified your original plan in SCARM to address your request for a return crossover switch arrangement and improved clearances between the inner and outer loops at the ends of the layout using GG switches. If you want the upper crossover switch arrangement reversed, that could be accomplished by substituting two GG LH 042 for the RHs shown here.
In the revision, there are Fastrack Transition pieces in orange and cut to length Gargraves straight sections in light blue at each end of the switches.
SCARM file is attached.
