Most of my comments relate to things that remain unreleased or investigating possibilities of how it could have been.

I reccomend going over to duneinfo.com and going through the deleted scenes section for the lynch film.

I also suggest looking through the 4th 5th and 6th drafts of the script and being familiar with both existing cuts of theatrical version and the Extended TV vetsion.

You could also watch fan edit on youtube spicediver dune alternate edition redux for a more coherant version yet this edit is not focused on restoring music cues or sound effects and is a kind of book edit rather than a movie edit. It is good though, just that it is not so much of a restoration it is a true fan edit in that sense.

The max evry scene is only unofficial deleted scene.

The deleted scenes with rafella delaurentis bonus feature are only ones shared there are a few snippets in documentary footage about costumes and special effects but they are very short snippets. You can see these documentaries on youtube.

The Dune Comic Book adaptation of the movie is another visual resource and structural reference.