I've been collecting Alien stuff for years and maybe you have use for anything I've stocked
You seem to have much more material than I ever found so I would definitely be interested to get a copy of the results as soon as you will be finished! Just a short list of what I have here:DVD Boxsets, both 20th anniversary and quadrilogy. I have the 5th disc for the 20th set in RC1 which was quite rare.
I have a complete and mint version of the VHS facehugger boxset.
The big US LD Boxset of Alien 1 and the regular US LDs for 2-4.
I have the Preversion of A3 that wasn't on the Quadrilogy but the quality is quite bad...
I have a japanese A3 Booklet for Alien3 that features several high quality scans of scenes from the Aline3 Preversion.
I also have the new Alien PSP UMD. It features the Film in 1.78:1 and was not cropped from the DVD Version but remade from the master. So you have a little bit more picture at the top and bottom compared to every other version yet. Unfortunately I haven't found a way to dump the thing on a PSP...
If you have use for any of the above material, just let me know...