I second the statement regarding the tail tracks and reach across. Lack of tail track space will become very frustrating as will the reach across beyond 30 inches. I would limit the width to 36 inches and use the space to the rear for scenery or buildings.
One thing to consider is coupling on a curve will be somewhat difficult. While I like the concept of fewer tangents, try out your arrangements on a table before a final build just to see if your operational concepts match the mind's eye.
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