Adywan has kindly supplied me with 5.1 rips from the laserdiscs so I have begun the process of syncing those up to the existing stereo tracks, although progress is slow at the moment.
Russs15 has supplied me with both the 'Flunk' and the 'Reivax' versions of ANH, and from initial impressions the flunk is far superior to all the other sources although it does suffer from a few section with corrupt frames, again the GKAR version has more frames than any of the other versions so it looks like ANH will mainly be taken from the Flunk with a few frames of GKAR thrown in here and there.
Also I'm working on a colour correction pluggin for avisynth because I'm not really happy with the options currently available, but first I need to learn C++ so I'm probably at least a week away from having anything useful.
I'll post a few comparison pictures from ANH soon.