I think what is needed is the help of other people.
Hopefully someone has the original vinyl and booklets that can be captured uncompressed and in a high-resolution.
ie, WAV/FLAC for audio; for images a minimum 300dpi BMP/PNG/TIF
Alternatively, get the credit cards out!
for example, here is an unopened Empire read-along. And on cassette, which is arguably easier to work with (no pops or crackles).
http://www.ebay.ie/itm/SEALED-STAR-WARS-EMPIRE-STRIKES-BACK-READ-ALONG-ADVENTURE-/310427272948
There are actually quite a few available on Ebay
In terms of audio quality we should be aiming for what was done with the Story Of LPs(see thread below). 16 and 24bit captures and cleaned. Well worth the download.
http://originaltrilogy.com/forum/topic.cfm/Star-Wars-Trilogy-LP-Preservations/topic/14575/