I am in the process of building a double track mainline layout on top of a 12” wide Versa-Lok retaining wall. I am using 1:32 Llagas Creek code 215 track. My minimum curve radius is 25 feet. What spacing looks best for running any of the following: 1:32 live steam, 1:29 and 1:20.3 trains? The hopper cars in the picture are 1:32 and the boxcars are 1:29. The track is set on 6.5” center to center spacing.