Below are pictures of Miyazaki's watercolour storyboards. The making of the film was dropped because the original creator didn't give them permission to make the film. Then Miyazaki and Takahata weren't as known to the world as they are now. I believe that if they requested to do the film now there will be no objections. But there's probably no interest anymore. It would have been really wonderful adaptation from the pictures I can see.