I have always been intrigued by this one, knowing there is only few videos and several minutes of it's existence. I wonder if the project got scrapped or simply lost, there wasn't enough info on the places I read...but it would be cool if someday the movie (or at least a big portion of it) gets found in the future.
from what I saw from the existent clips, the overall style and animation is very similar to the 1993 stardust crusaders OVA.
here is a video of existing footage of it:
https://www.youtube.com/watch?v=49d3pZG0lXc