I found a couple of sites that might be of interest to you or to others (you may have seen them before...indeed, either of them might even be your own sites!). While not necessarily within the scope of what you are focusing on here, they may well serve as good supplementary info.
The first is a site documenting the history of the Star Wars movies on home video, detailing the differences between all the versions, etc. It is at
http://www.davisdvd.com/misc/ep4.htm
(with links at the bottom of the page for the other episodes).
The other is a site documenting the various Star Wars DVDs available, retail as well as bootleg (especially for the original trilogy pre-SE). It is here:
http://www.prillaman.net/starwarsdvd.html
Anyway, keep up the good work!
nabziF