Bryan,
You'll like the O72 switches as they are the flattest for crossovers.
I don't recall how you are operating your trains.
You may have mess with isolating loops if you are running conventionally.
Crossing over out of the corner helps a lot with the small radius switches. It takes the jerky movement out and makes engines and cars happy.
The switches set the track spacing. Make the outside loop first with the O72 crossovers. They need the 1 3/8" no-roadbed piece between the turn-outs and one half-roadbed piece on the thru end. RR-T has the as an X number.
The O48 and O36 don't use them.
BeachHead2's idea looks like a good start.
What's the current switch inventory?
