What technique was used in the process of making the Statue of Liberty?

A technique called repousse, which is a technique for creating sculptural forms by hammering sheet metal inside molds was used to make the framework. Lighter than cast metal, repousse was the only method available that would allow for such a monumental work to be shipped overseas. The Statue of Liberty stands 305 feet tall, and used 31 tons of copper and 125 tons of steel. Winds of 50 miles per hour cause the statue to sway 3 inches and the torch to sway 5 inches. Source- Purdue University

Yes that is true