I think this is an old post, but since 2011 (i think) the copy of the workprint was available. I've download it and burn a dvd at the same time. I've found this DVD this month in my house and I've got it online again. Uploaded to rutracker and archive web. Hope to see you guys getting it. No one of the people who had a copy of it have reuploaded, so it was a shame. The .VOB files are the one's with the 'full' quality. It's so sad that the only copy have this quality BUT, it's an amazing thing seeing the movies changes.
Archive.org is more secure to be downloading the file, while rutracker it still under approval.
https://archive.org/details/thelionkingworkprint_202101