If we were going by original intent. Lucas would have directed a Flash Gordon movie if given the rights.
Or a remake of the hidden fortress in a sci fi setting,lol.
Read the 1973 treatment and then the 1974 script its so vastly different from what we ended up with.
Anybody who believes the trilogy was planned as executed from day one is deluded beyond measure.
Other than having Vader, The empire and the rebels, han, luke and leia the sequel could have been about anything.
There are themes and concepts in embryo in the treatment and prototype scripts but entirely different as done in the films.
Some characters where split and divided into more than one and others were merged.
The one thing i can say about the rough draft script less kiddie then the finished 1977 film and the poltics are heavy handed like the prequels.
You have a sex scene or at least mentioned if not shown. You have a emperor based on both Richard Nixon and Adolf Hitler called CoS Dashit. You have a monarchy in which Leia the non sister in this version is the princess her father is a king. But elected monarch. It is like Lucas wanted the fairy tale kingdom idea as well as democracy,lol.
The rough draft script is parts hidden fortress, yojimbo and sanjuro. Parts Flash Gordon and John Carter of Mars, part Dune,lol. Once you get to the third draft you have dialogue directly lifted from the hobbit and a theme not unlike lord of the rings. Except that the Kiber Crystal could be used for good as well as for evil. Unlike the ring which was wholly evil in origin.