About the question posted by Elwood Johnson of material used to build it. This is a quote taken from the Evergreen aviation &space museum: "Hughes took on the task, made even more challenging by the government’s restrictions on materials critical to the war effort, such as steel and aluminum. Six times larger than any aircraft of its time, the Spruce Goose, also known as the Flying Boat, is made entirely of wood." So the anwser is yes, she was made only from wood