We're here to help, so asking for changes is all part of the process.
Here's the latest iteration (just the track area) with American Flyer S track added to the outside. Track selection is limited and may require some custom cutting to get things to fit. I didn't snip the tracks so you'd see where they don't connect. The purple rectangles are 2.5" in width and the Yellow ones are 4.5" in width to show center-to-center clearance.