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wrote:
I am more concerned with the design of the hull. This is a project for
my High School Engineering class, and our teacher wants us to use only
cement to get our craft to float.

I think I would model it after river barges. very flat bottom, straight
sides and rounded up at both ends. Rectangle shape. It is used to haul
tons of coal around here every day. It is also a very simple shape to
produce. Also agree with everyone else that you need a mesh inside to
keep it all together.