Well, after a while of not doing anything with this, I've completed work on GOUT-synched LFE tracks for the entire original trilogy. When combined with the 1993 soundtracks these make for an awesome movie experience. The sound becomes more powerful and thrilling while retaining the authenticity and rightness associated with the laserdisc mixes.
I put flac files of each track together into one rar file, which can be found here: http://www.sendspace.com/file/70v75n
I also created a demo AC3 file containing some of the bass highlights. If you're interested in the bass but aren't sure whether you want to see the movies this way or not, this should give you an idea what it'll sound like. It includes the opening Star Destroyer flyby, the destruction of Alderaan, the Falcon's emergence from lightspeed, and the destruction of the Death Star from Star Wars; the probe droid launch and the beginning of the battle of Hoth from Empre; and the destruction of the sail barge in Jedi. Can be downloaded here: http://www.sendspace.com/file/7rt40m
This demo is in 2.1 format; that is to say, the sound will natively play from the left and right speakers and subwoofer only. Turning on Prologic 2, on my receiver at least, drops the extra bass because it sees it only as a stereo signal. DTS Neo:6 mode keeps the LFE in place. Some people prefer the DTS mode for surround, some like Dolby's version better, it's a matter of preference and results probably vary based on the source material. More advanced implementations such as Prologic 2x might not ignore the LFE, although I can't say for sure. One could always upmix the soundtracks into five channels on the computer and combine with this LFE to get a 5.1 mix; I am sure that would sound fantastic.
With this release I have improved upon the early version of Star Wars that I put out last year. The first flyby has significantly louder bass than before--whenever you hear about the 70mm soundtrack the roar of the Star Destroyer is the thing that stands out in people's minds, but in the special edition it really wasn't all that strong. The Alderaan and Death Star explosions are much better than before as well. R2's fall with the Jawas is reduced to a more reasonable level, so it doesn't feel like a Star Destroyer just crashed into the planet when he hits the ground. Empire and especially Jedi needed less work; I only had to change the volume in a few places.
Feel free to comment here on your experience with teh bass, and what kind of subwoofer you've got, etc.
For my personal version of Star Wars, I replaced the first cell bay shootout from the 1993 mix with that section from the original stereo mix in order to get rid of the annoying broken glass effects. The rest of the '93 changes are good, or at least tolerable, but changing this part gets rid of the "glaringly inauthentic" feel it otherwise has. The result combined with the bass gives it a decidedly "70mm-ish" vibe. :)