Clayton worked with all of them but most notably Lucas and his Skywalker Ranch studios inMarin County, California, where he engineered sound recordings, which included the first recordings at Skywalker Sound with the San Francisco Ballet Orchestra.

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Extensive art work including character designs, costume designs, and set designs were all developed by a top team of concept artists and designers who worked for more than a year on the third floor design studio at George Lucas's Skywalker Ranch's main house on the project.

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Lucas retreated to his 4, 700-acre Skywalker Ranch, north of San Francisco, and cloistered himself.

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