So, having skipped through it briefly on the MacBook whilst I was away, I finally got to sit and enjoy it in 4k, on a large screen 4k tv and watch it in all its glory.
Bravo! Very well done, and overall could easily become a 'go-to' version for viewing.
If I were going to give constructive nit-pick, there are two amendments I'd personally make;
1: re-include the Facehugger in the opening (I get the intention in making the reveal later a surprise, and it was edited so well, but for me personally I'd have liked the edit from the workprint with the Facehugger but no egg, in keeping with Fincher's intention.
2: the new sunrise at the end: whilst beautifully done (it'll make a nice wallpaper actually!) I think I'd drop it.. 1 - for continuity, as you have the sun rising on the same side of the planet as it sets earlier in the movie (which doesn't make sense), and 2 - because every other revision made is either an edit, or a tasteful redo of the special effects to match the original movie.. this was the only shot that doesn't belong (in any cut). I'd personally drop it.
Beyond that, fantastic and very professionally done, I thoroughly enjoyed it!
By the way, did I miss an update? What happened to the "for the last time" line that was going to be reinserted? It seemed to be missing? 😊