I'm afraid that BATB is one of a kind, SilverWook, the other films weren't presented with a workprint AFAIK, even as a bonus. But I can be wrong...
Speaking of this one, here's sample of my atempt of colour correction. Nothing much, but it's an atempt. At the moment, I'm nearly throwing the towell on this one because there are just too many elements that had been tempered manually & separately over the years. That's why I'm wishing for a print be found.
Here's the recolored sample: http://www.mediafire.com/download/4gqy9edzd9unbqr/Test+1.zip
VS the original 2D BR: http://www.mediafire.com/download/4c4iwt48zsih50x/Original+BR.zip
Feel free to share your opinion