I'll take some licenses in my post inside this topic.
I would rewrite the third episode (sixth chronologically) of the original trilogy. In this rewrite, the title would be changed to the original: Revenge of the Jedi.
The first scene would undertake with the Emperor coming to the Imperial capital in Had Abaddon (a.k.a. Coruscant), where two new Death Stars would be in construction. The emperor would meet Vader to prepare the final climax. The most of the Imperial Army and Fleet, together with the two new Death Stars, would be in Had Abaddon.
20 or 30 years after ESB (designed so that the original actors could film the movie today), Luke Skywalker would return to Dagobah to complete the last steps in the Jedi way, but Yoda would die and this part of the learning for Luke would remain unfinished, sadly.
Also, Han Solo would be rescued by Lando and Chewbacca and joined with the Rebel Alliance, most powerful than ever. In a strategic movement, the Alliance would ask to set free the enslaved home world of Chewie, Endor. With the wookiee army in his power, the rebels will attack the Imperial City.
Han, Chewie, Princess Leia, Lando, C-3PO and R2-D2 would liberate Endor of the imperial troopers. However, at the last moment before escaping, Han would be attacked by an old enermy, who has been learned that have escaped from Jabba... Boba Fett. Boba would kill Han and would leave to collect his great reward.
This event attracts Luke to the dark side. Luke decides to liberate the most hard criminals of the imperial prisons (maybe in Tatooine or other planet. In this act, Luke confronts the villains similar to the Jabba's Palace and Sail Barge Assault scenes: confronts Rancors, etc). With this, all the criminals go to Had Abbadon too.
In the final battle, the two fleets fight hard. The Imperial Fleet decimates the Rebel Fleet. In the planet, Luke moves forward with his X-Wing, reaching Vader. The criminals attacks everywhere, destroying imperial troopers and rebel troopers. Also, the Grand Moffs see the opportunity to dethrone the Emperor and begin to destroy each other, causing serious damage to the Empire.
Luke enters into the aggressiveness and defeats Vader, but not kill him. Luke allows the officials -that Vader humbled previously- end with him. Luke now goes to the Palace, where is the Emperor. The Emperor would defeat Luke and would oblige to join him. In the rebel cruise (in the space battle), Leia would be captured. The Emperor would bring prisoner and would ask Luke to kill her.
The wookiees would take the control of a Death Star. In a tense moment between the two death stars, each shoot to destroy the other. The wookiees won and destroy the other. Then, Luke discovers that Leia is her sister, and finally don't kill her. In that moment, the shoot of the Death Star to the imperial palace interrupt the scene. The Emperor disappears in the explosion, laughing. But don't know if he has survived.
Leia would have taken a wounded Luke (similar to Luke and Vader in Return of the Jedi). The battle would stay in tables with the Fleets, but hints that could kick off a peace era. Leia returns to his people to govern their remains, and Luke, between the dark side and the good, decides to go away to think if he can overcome the dark side and continue to teach the Force or not, and Chewie returns to Endor.
The argument would leave the door open to a new trilogy, load more philosophical, where a older Luke (similar to Ben Kenobi), debates with his apprentice whether to continue teaching the Force or not. And the apprentice, now the main character (maybe Luke's son) confronts the Emperor (showing that survived).
And now, the prequels.
In the first episode, we follow Obi-Wan and Anakin (a Kenobi's apprentice) fighting in the clone wars. They are joined to a young man named Vader, who would became another Kenobi's apprentice.
In the second episode, Vader turns to the dark side, killing some of the Jedi Knights. The Emperor uses him to set up his army, and Kenobi hides from the attacks, and Anakin returns to Tatooine, with the Lars, and meets his wife. At the end, Kenobi and Anakin regroup to fight the Empire.
In the third episode, conclude the clone wars, and there is an intense struggle between Anakin and Vader, where Vader tricks Anakin with his redemption attempts. The spectator will not knows if Vader wants to surrender or is lying. Also, Vader kills Anakin apparently, but this isn't shown. Only we would see Obi-Wan sad.
Watching The Original Trilogy, we discovered that Anakin kills Vader and becomes "Darth Vader" with the black armor due to injuries that Vader caused in him.