A panel apparatus is described that includes a first sandwich panel and a second sandwich panel arranged substantially parallel to each other, and the first sandwich panel and the second sandwich panel each include a core material inserted between at least two skin layers. The panel apparatus also includes at least one mechanical fastener mechanically embedded into the first sandwich panel and the second sandwich panel. The at least one mechanical fastener at least extends through one skin layer and into the core material of the first sandwich panel and at least extends through one skin layer and into the core material of the second sandwich panel, and the at least one mechanical fastener is configured to accept insertion of an item. Methods of assembling the panel apparatus are also described.