About this scene:
In the beginning of Return of the Jedi, Luke constructs a new lightsaber and hides it inside of Artoo Detoo, along with a message for Jabba the Hutt.
This scene would have set things up for the later action at Jabba's palace, but it also would have given away the surprise element of Luke's hidden lightsaber.
No actual footage of this scene has appeared anywhere, nor have any photos. According to Anthony Daniels, this scene was partially filmed but never completed, although music was scored for this sequence by John Williams and is available on CD. The scene shows up in the novel and radio play as well, but takes place inside Ben Kenobi's hut. From the matte painting and storyboard that exist, it appears the location was changed to take place inside a cave on Tatooine rather than Ben's hut. The footage that was filmed is apparently of Threepio standing outside the cave.