Might be too late to ask, but why are you going to trim down Han Solo’s rescue so heavily? I think that some trims here and there are much needed, but I don’t know if it’s necessary to put it down to 20 minutes. I’m pretty biased towards darthrush’s edit, but it is really a fanedit you could look for inspiration upon. It trimms some things down here and there but his version is not that much shorter from the original, and not nearly as cheesy or stupid.
Have you ever given any thought to making Jabba’s Palace not be in Tatooine? Is that even possible? I think it’d be cool to see a new planet, and it’d take the rehashness away from your RotJ even more.