According to an old "Filmfax" magazine, he wrote the story and was quite involved with the Fett cartoon, but didn't have the time for anything else. He apparebnt;ly sat down with the producers and created a basic plot outline. He did in fact intend the basic story to be there, of Chewie returning to his family for Life Day, and be evading the empire. What they (the producers Ken and Mitzie Welch) did was take HIS script and basically rewrite many scenes without his knowledge or approval. And the original director, David Acomba, was fired at the very start due to "creative differences." Acomba was an old roommate of Lucas' in college, and knew his ways, and what he expected pretty well. What happened was with a horrible script, 20th century fox made the producers/directors film what had been written. And the actors didn't question the producers, Mark Hamill said he merely was "making those above him happy." When Lucas saw the finished product, he was horrified. I mean, the basic story was still there, but the format he had originally envisioned was destroyed.