Abstract: The present disclosure provides a structural assembly including a frame and a plurality of panels. The frame includes a wall partially defining an interior region. The plurality of panels are disposed at least partially in the interior region and coupled to the frame. The plurality of panels includes a first panel and a second panel coupled to the first panel. The first panel includes a first side, a second side opposite the first side, a first surface, and a second surface opposite the first surface. The first surface and the second surface cooperate to define a first corrugation extending in a first direction between the first side and the second side. The second panel includes a third surface defining a plurality of depressions and a fourth surface opposite the third surface defining a plurality of protrusions. The plurality of protrusions are complementary to the plurality of depressions.