I've done a lot of research on the original theatrical colouring and I found a really easy way to share it with people. The GOUT actually has most of the original colours hidden in it. You just have to extract it. It's not 100% accurate, and it depends on how you have your settings; the pics posted I would say are about 85-90% accurate overall. That's an improvement from the GOUT uncorrected, which I would peg at about 30%.
Very pic heavy, so I am posting this off-site. Only SW is up. Need more pics. ESB is much more interesting, hopefully have those up by the end of the night. You can try it out yourself if you have VLC player.