A fully or partly edged panel (10; 200) of wood or wood fiber. The panel (10; 200) includes a sandwich blank (10*; 200*) having outer layers (11) of solid consistency, and at least one supple inner layer (12) with a lightweight, possibly “honeycomb” or supple foam material, structure. The panel (10; 200) is characterized by having at least one spacer (13; 213) inserted between the two outer layers (11) of the blank (10*; 200*) at at least one corner thereof. The peripheral outer faces (15) of the blank (10*; 200*) may be edged with an adhesive edging strip (16). Also described are methods (100; 1000) for manufacturing the panel (10; 200).