PaulisDead2221 said:

.... I have a small side project in which I'm trying to create an general approximation of the original six track mix. Sources include the 2004 SE DVD 5.1 surround track, the 1997 SE 5.1 surround track, the stereo six track mix preservation from Belbucus, as well as the isolated score. The idea is to repair/re-approximate/mix/rework the various mixes into a 5.1 experience of the original six track.

This side project definitely gets the Moth3r seal of approval. ;-)

Seriously, I've considered doing the same thing myself.

I assume your audio will be GOUT-synched? A good reference would be the '93 mix, run through a software pro-logic decoder to get four (left/right/centre/surround) separate channels. The effects in the extracted surround channel could be replaced with the equivalent full-range sounds + LFE elements from the '97 mix where applicable. (Is there actually anything useable in the '04 mix? According to general opinion, it's an abomination.) Of course, the '93 additions would have to be removed to be truly '77 authentic.

When you've got a rough draft together, it'd be worth contacting the forum audio experts (thinking Neil S Bulk and Belbucus in particular) and asking if they could audition and comment on your mix.