Aircraft panel and method of constructing

A method of constructing a panel for an aircraft subassembly is provided. The panel has interior and exterior sides relative to the subassembly and comprises a skin and a support structure. The support structure comprises a plurality of longerons and frames constituting support-structure elements and arranged substantially in a grid, and projecting substantially transversely from the skin toward the interior side. The method comprises providing a flat sheet of structural material, wherein the sheet comprises one or more cutouts, and forming the support structure by folding the sheet, wherein the longerons and frames are formed from overfolded areas of the sheet adjacent the cutouts, and wherein non-overfolded areas of the sheet constitute the skin.