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The last two issues of Sail Magazine have featured articles by the incomparable Dave Gerr on metal boat construction. There''s probably just enough information in the articles for you to decide if you really want to delve deeper into the subject- there''s a lot to be learned about metal types, fabrication methods, material-specific design requirements, metals isolation, corrosion prevention, hardware attachment, and maintenance. All are deep and nuanced subjects, and likely alien to most folks'' workaday knowledge.
And as an aside, I''d recommend all of Gerr''s books (except perhaps the propeller book, unless it''s a particular passion of yours)- he has an easy writing style about complex and technical subjects, and draws on a varied background for examples to illustrate his points.
If a performance boat is still something you''re thinking about, I don''t think you''ll find aluminum a useful hull material below around 40 feet, and perhaps not even that small.