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Why would you want to make little squares? Why not just leave the sheet whole?
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Squares are supposed to be used with crosscut wood pieces (like balsa). This is the most rigid form of wood construction. However, you can’t get a big sheet of that material (it's like cutting 1/2" pieces off the end of a 4x4).
Also, as an added benefit, the epoxy between the squares prevents moisture infiltration to adjacent wood.