Atlanta developer Jim Jacoby has taken another big step toward remaking the OFS plant at Interstate 85 and Jimmy Carter Boulevard into a what it calls the largest movie studio campus in the Southeast. Jacoby, chairman of Jacoby Development Inc., says his company has struck a partnership with Los Angeles-based MBS3. Its television and feature film studio is home to James Cameron's Lightstorm Entertainment and the next three sequels to Avatar, a science-fiction blockbuster from 2009. MBS3 will…