Its not remotely the same as the analogy you suggest - they are variations on the same frameset. If you bothered to google you would see they do the frameset in conventional and rohlof versions. Here is the conventional (ableit specced to the max)
http://blog.kgsbikes.com/wp-content/uploads/2009/06/Co-Motion-Americano-Ortlieb-Tubus.jpg
@vinylvillain started
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Its not remotely the same as the analogy you suggest - they are variations on the same frameset. If you bothered to google you would see they do the frameset in conventional and rohlof versions. Here is the conventional (ableit specced to the max)
http://blog.kgsbikes.com/wp-content/uploads/2009/06/Co-Motion-Americano-Ortlieb-Tubus.jpg