Abstract: A sandwich panel structure comprises a slotted panel and a tabbed panel. The slotted panel includes a slotted panel core body and a first slotted panel facesheet. The slotted panel core body defines a first slotted panel side with the first slotted panel facesheet disposed adjacent thereto and including a plurality of first slots. The tabbed panel includes a tabbed panel core body and a first tabbed panel facesheet, the tabbed panel core body defining a first tabbed panel side with the first tabbed panel facesheet disposed thereto. The first tabbed panel facesheet includes a plurality of first tabs disposed along a first joint edge with each of the first tabs respectively sized and configured to be received by a respective one of the first slots upon insertion of the first tabs into the first slots for joining the tabbed panel to the slotted panel at the first joint edge.