That's quite effective - the balanced picture quality and smoothed out sound mix make for a very convincing whole.
You're running into an issue that I found when I played with Alien footage myself, though. It seems Scott shot a great deal of coverage on certain sequences (perhaps most), giving himself plenty of options in the editing room. As a result, the 'official' presentations of deleted scenes assembled at different times - appearing in the old laserdisc package, the DC and various documentaries - include alternative footage of the exact same events. If you try to combine everything and waste nothing, you end up with a great deal of redundant material (hence Ripley taking a full minute to climb down the ladder).
If you're going to edit a version of the film that's both extended and coherent, you'll have to make some choices about which shots/angles you prefer - an edit that incorporates 100% of the available footage will be somewhat repetitive, to say the least. My advice is to let go of absolute completion and be prepared to get creative.
benduwan said:
do you combine all releases of alien and including all deleted scenes they out there?
a 3h movie?
why you don´t use the bluray?
He answered all of these questions in the first post, if you read it.