I also believe that the 35mm Dolby stereo was done first, hairy_hen. It makes no sense to remove certain sound effects in it if it was the second mix and then put them back in again in the mono, like the sound in the trench you described and later the exploding Tie Fighter wich is completely silent in the 35mm. ("but the first mix also had the most errors.")
Anyway, your test sample sounds great to me, good job!