Mayhew’s pics are actually of the shooting script. Luke’s surname was changed during the shooting process (happily before any footage had been filmed with the old name). The opening crawl was likewise rewritten in post.
So is that why Mayhew’s script says “saga 1” instead of “episode 1”?
According to Wookieepedia the third draft had “saga” and the fourth draft had “episode”, so what version is the shooting script based on?
The complete versions are easy to follow for the most part, bar the titles. We do have for the most part all of the major ones (including the IMO bizarre first draft). In regards to the older versions, many of them are simply half-baked story ideas or world-building things.
There was an actual Journal of the Whills at one point; a three page first-person account of a very different story (which I think could have made for a very interesting take on the prequels). From there, it was mostly scattered notes until the treatment (which is actually on that site linked earlier, and interesting because Lucas actually states this takes place in the thirty-third century, instead of long long ago).
You can find a bunch about Journal of the Whills from this thread;
Do you have some idea of have many of his “half-baked” older version I could potentially find online?
His early notes are actually what fascinates me the most here (the more separate from the finished product the better).