Curious if this has been brought up in this thread (probably has but i don't remember everything i read in this long thread). Why not take a laserdisc with highest resolution (pal ld's) and make sure they are fullscreen dvd's (pan and scan or whatever). And seeing if you can't piece together scenes to patch into the dvd's. I'm mostly thinking that depending on how large something is, you might have enough size in a fullscreen pal copy that wouldn't look so horrible in with the regular dvd res. Say for instance Vader's head just the mask down to the neck, now on dvd in widescreen it will be smaller. pal fullscreen might be larger but when resized to fit the smaller dvd, it might be similar resolution that way.

Just a curious idea, which probably wouldn't work, but you never know.