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Strewth Oliver!It's like a rowing scull!
Stuart, As a suggestion for weight, you might try a cement hull building over a clay dummy. There is actually a long history of cement hulls for cargo ships and some small yachts. Used to have a book on cement hulls.
Thanks for the encouragement Dave! I am even now trying to use my very basic Greek to tell two Albanian builders to move a wall to make my workshop bigger!Stuart