You wrote; "These folks did “not” build their boats out of reed but rather used the more durable Acacia hard wood much like the Acacia-Koa wood used by the Kanakas from the Sandwich Islands (Hawaii). Mature Koa leaves are strong and resist saltwater making them great for lodging and sealing boats."
I do not know if I can really agree with you on the above assumption? Obviously I have read all of the books written by Thor Hyerdahl and you may have not? But his thesis about the durability of reed boats, may incline you to the reed boat side? So do not easily dismiss his ideas, although he has been dissed by plenty of experts in the last 25 years or so.
An example of his work that you might want to persue is entitled; "Early man and the Ocean."
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