This giant Flying V style guitar was seen at the New York guitar show. The massive scale length means you can get almost subsonic notes on it. An even bigger guitar was made as a school project at the Academy of Science and Technology, Woodlands, TX. It is over 43 feet long but still playable.
The largest Fender style guitar is a mere 10'2". The giant stratocaster was made in 1980 by Lynn Ellsworth of Boogie Body Guitars, Ron Armstrong of Stars Guitars, Seymour Duncan of Seymour Duncan Research Labs, and Oscar Ortiz.