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Joe,
it could be that you do have it right and the extra wood is intended to stiffen up the 3 ply vertical skin near the struts. sometimes parts get designed to do one job and the fabricator doesn't really understand what's happening and makes them look like something else. seems like just adding vertical fillers between the ribs would have been simpler. why the diagonal, unless these were also intended to carry the plane load down to a cradle which supported the floats at these offset points.
I like what you're trying to do here. it is vital when you're doing sometnhing like this to try to understand why everything is the way it is. this might protect you from design "features" which either don't do anything constructive or are actually not good.
Was this plane actually engineered or simply designed?
john
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