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If you want to build your own trebuchet, first cut and sand the frame pieces and the swing arm. You’ll need 2 long base pieces, 2 uprights about the same length as the base pieces, and 3 cross braces the width of the trebuchet, and 4 support braces for the uprights. Your swing arm should be 1 and 1/3 times the length of the base. Assemble the base and the support braces, then attach the uprights and braces to the base pieces. Finally, attach your axle, swing arm, sling, and counterweight. Keep reading to learn how to use your trebuchet!