You can get every Indiana Jones Movie script online except for Crystal Skull. There is no illustrated screenplay, or facsimile script book.
Though with some searching like I did you can find Indiana Jones And The Saucer Men from Mars, Indiana Jones and the Monkey King, and Of Course, City of the Gods. All are legitimate scripts for Indy 4.
The one closest to what we finally got yet different is City of the Gods. For Instance in the Darabount Script opens with lizards instead of prairie dogs, and the song shake rattle and roll instead of hound dog by elvis. The music was swapped to a different scene.
There are some very bad lines of dialogue equal or worse than what ended up in the movie. Like Henry Sr. Slapping Indy in the face because he was accused at the university and by the gov. as being a commie and wanted to walk away, he says to henry jones jr aka indiana, "now i know why you're are named after the dog"
When Connery turned the project down it is fairly obvious that the father son relationship was shifted to be between Indiana and his son.
This is why the mutt character is not in this draft.
Also the Script by Frank Darabount seems to be as much Pastiche Raiders as it is Last Crusade.
At least Steven and George aimed to have kotcs stand on its own merits whether they failed or succeeded is another matter entirely.
Too bad that it seemed to be more of a nostalgia trip than a film all its own. It relies on the good films in the series to be enjoyed, same with the star wars prequels people tolerated there mediocre plot because of the love they bore for the originals from 1977-1983.
Then again Raiders seems to be the only film in the series that holds up to repeated viewings. I used to Love Last Crusade and to an extent i still do but i do notice flaws in it some minor and others major.
Other than the bits cobbled together from the raiders script namely the best scenes in the film of temple of doom shanghai and the mine cart sequence, the film is an entire waste. If it was not for Williams providing some wonderful music that film would fall flat.
I will admit i even enjoyed the ludicrous raft moment in the film everyone seems to compare to the nuked fridge which brought me straight out of the movie willful suspension of disbelief only goes so far. Star Wars can get away with things Indiana Jones cannot, Indiana Jones is not science fiction and while the series fiction pretends to be set in the real world.
Lucas cannot get away with the same excuse as once upon a time, or A long Time ago, in a galaxy far, far away.