I’d do some minor tweaking to the first two movies, fix some of the dialog, change the cantina setting so that its utterly impossible to ever redo the movie with Greedo shooting first.
The third movie would be completely different. First and foremost, none of this crap about Luke and Leia being brother and sister, nor any of this crap of Vader being Luke’s father (he’s some kind of freakin’ lizard, who doesn’t breathe a normal oxygen atmosphere). Nor any second Death Star or ewoks. I’d also make it clear that the Empire was not something recent, but that it was a growing cancer which was spreading throughout the galaxy and that the Republic had been absorbed (forcefully) by the Empire. No long drawn out rescue of Han, just a fast, brutal commando raid. Boba Fett does not die like some kind of punkass bitch, he manages to fight his way successfully out of the area and flees. Once Solo’s rescued and revived, the rebellion finds out that the Emperor is enroute to a star system to sign a treaty bringing that star system into the Empire (after the Empire has pretty much pounded them into pulp). So they launch a raid on the floatilla protecting the Emperor. Massive space battles, with burning ships raining down on various hapless planets. The final showdown between Vader, the Emperor, and Luke, takes place on a ruined planet, with a harsh atmosphere that limits the amount of time Luke can survive without breathing gear.
Shoot much (though not all) of it, from the perspective of Leia on one of the rebels capital ships, being able to only hear parts of what’s going on. The climatic battle (with no force lightning) will, feature Luke nearly getting killed by the Emperor, being saved at the last second by Boba Fett (seems the Emperor’s check bounced), with the Emperor gone, a severely injured Luke will go after Vader, telling him before he strikes him down, “You killed my father, you son of a bitch, prepare to die!”
The first prequel will be about the spread of the Empire, as it encroaches upon the Republic. Obi Wan and Anakin will feature as Jedis who are essentially like Elliot Ness’ “Untouchables” within the Jedi organization. Yoda will be the wise master, who longs for the old days of the Jedi, and is unable to do more than give a small amount of aid to Obi Wan and Anakin. “Pirate forces” (in reality, operatives of the Empire) will conduct raids in both Republic and Empire space. The Empire will blame the Republic for the raids, as well as offering succor to those systems being menaced by the pirates. The Republic will begin to fracture under the constant raids of the pirates, and the seeming inability of Republic forces to do anything about it. Vader is shown to be a double agent of the Emperor, working to undermine the Jedi from the inside.
The second prequel will be the clone wars, and this will not be about armies of clone soldiers, but clones created by the Empire to take the place of key figures in the Republic. The film will crib a lot from the themes of Blade Runner about what is identity, with characters questioning themselves, and each other. It ends with the pirate forces launching a raid on the capital of the Republic, which fractures the Republic into several different groups. Some systems joining the Empire, some remaining with the Republic, others declaring themselves to be independent of either body. The Jedi fracture as well, with Anakin, Obi Wan, and Yoda remaining true to the ideals of the Republic.
The third prequel is the final subsuming of the Republic into the Empire. Now, the Empire dispenses with the pirate forces entirely, and begins overtly attacking any of those worlds which dare reject the Empire. Anakin discovers that Vader is a traitor and races to save the Jedi from Vader’s trap. He is only able to save Obi Wan (Yoda’s never in any danger, being clued in by his Force abilities that its a trap and retreating before the shit goes down) and is struck down by Vader. Obi Wan, realizing that Vader will want to hunt down any surviving Jedi and/or their families, fakes his own death, and smuggles the infant Luke (managing to get him away from Anakin’s wife at only the last possible second) to Tatooine and leaving him with Anakin’s estranged brother, Owen.