I think you might have the wrong idea of what was intended for the parallelogram
2400mm (8ft) to 3600mm (12ft) there abouts
Like Farriers it depends on what are probably metal links between the hulls illustrated as lines in the diagram, each around 600mm (2ft) long. There are other ways of doing the same thing, like using open top rectangular sockets to accept the beams on top of the weather hull etc. It would also be acceptable to have the joints in different places, its just a diagram to illustrate how it might work.
There is 400mm (1ft 4in) difference vertical gap in the middle diagram so obviously it cants over slightly
http://i194.photobucket.com/albums/z179/realink_album/Image1_zpsaexqjcaj.jpg
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Posted by: robriley@rocketmail.com
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