The ROTJ collaborative thread is a wealth of ideas, both on how to edit Return of the Jedi, as well as how to collaborate in an edit.  Emanswfan has taken leadership of the project.

Password for all ROTJ-related clips: ROTJ

A very rough edit of how the Battle of Endor could go
A very rough idea of how ROTJ could end

Rough edit based on the final script with some deviation:

Part 1  Part 2  Part 3  Part 4