Use these large gussets to strengthen your fuselage after construction (see the second image). These are large (1/2″ on the short side) with a 1/8″ square cutout to fit around the stringers. They are easily trimmed for smaller sticks. Put them in place and hit them with a drop of thin CA; trim if necessary. The additional weight after installation is negligible, but the box rigidity is increased tremendously.
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