The sandstorm is obviously hampered by the missing sound elements but it does work better.
Vader communicating with Luke makes more narrative sense here but the flashbacks are a big mistake.
Rather than a duplicate meditation chamber on the Death Star we could have Vader on the bridge of the Executor reaching out (end of ESB style) I would also use Luke from that film for reaction shots because he seems to be smirking in the ROTJ footage. After the glove going on the stinger to the sequence could be our first view of the Death Star out of the window.
As for briefing my only suggestion here would be to swap Threepio's lines in this act.
So when Luke joins the crowd he says "here we go again" and when the leave "Exciting is hardly the word I would use".
Generally Threepio could do with a bit more trimming (less "We're Doomed" etc).
Trimming Lando's lines helps these scene a lot.
In an ideal world Ackbar lines would be coming out of a translator device (he sounds too human for that head).
I would trim most of Vader and Palpatine's repeating their declaration to turn Luke etc.
Putting the surprise in Vader's questioning in the beginning removes the continuity problem of him being totally fine with the concept when the Emperor arrived at the station.
So glad you cut Harrison pulling silly faces to the barest of minimums when they are captured by the Ewoks.
I still don't think a flying chair would phase the Ewoks that much or panic even Threepio that much either. Another in an ideal world situation would be to turn this expression of their God's anger into something weirder than a speeder bike or a metal moon.
I love the re-arrangement of the Endor battle.
I miss the amazing came out of nowhere traps but at least it makes sense that they are gone.
I would like you to push it a bit further so Luke under the stairs corresponds with Leia being shot.
Her psychic pain breaks Luke's concentration so Vader can then zero in on her as a means of breaking Luke.
Leia in peril is something that should have been built on and not the source of a cheapish gag.
The music at the end is a good idea. It doesn't quite match the mood for me it's too sombre for a celebration.
I would have put a bit of Sir Alec's voice in there.
Ben fibbed terribly and he needs to give some sort of account for himself even if it's off-screen and echoey, to be honest I hardly noticed that scene going either.
Generally speaking this version intensifies the impression that the Rebels could lose by removing much of the levity added by slapstick.
On the whole this is an astonishing effort and full of ideas that hopefully can be built upon by others with more special effects abilities and access to actors and props.