We looked at some of the ideas. Its pretty apparent that originally the Death Star was suited only for the end of the trilogy and built over the Wookiee world. But with Chewbacca bringing us modernized Wookiees and the Death Star used up in ANH, that's not possible. An attack on the the capital - considered in some treatments - is equally without credibility, because disregarding the EU, the scale of the Rebellion presented in ANH and TESB still disallows for any attack on the capital that probably wouldn't be met with incredible force. Also, the Death Stars in some treatments still leave us with repetition.
The challenge is to rewrite ROTJ. Either novel or screenplay format is acceptable. You must redeem Lord Vader and nearly tempt Luke Skywalker to the Dark Side. Palpatine must be defeated, but not necessarily killed (this was not the original intent in the OT and who knows, if its good maybe we'll get several fan authors on sequels

You are only to consider the films (theatrical release, not special edition) and secondary sources of A New Hope and The Empire Strikes Back to be canon.
Any takers?
EDIT: Added something about Palpatine's status requirements and prizes.
Prize? Shit. Hmm. Give me a bit to think about that and the due date.