A new, permanent addition to the sprawling National WWII Museum in New Orleans is a three-story complex with displays as daunting as a simulated Nazi concentration camp bunk room, and as inspiring as a violin pieced together from scrap wood by an American prisoner of war. The Liberation Pavilion — set to open Friday with ceremonies including around 40 surviving veterans of the war — is ambitious in scope. Its exhibits filling 33,000 square feet (3065.80 square meters) commemorate the end of the war's death and destruction, emphasize its human costs and capture the horror of those who discovered the aftermath of Nazi atrocities.