For more than a year now, I have been working on a full, feature length animated Zelda movie, The Legend of Zelda: Dark Triforce. So far, alot of the animation is in early stages and I have to go back and fix some scenes but I hope to make this movie as epic as possible.
I would recommend using it instead of importing .png images into SketchUp. You will have more control over the animation and it will probably look better. And if you use SketchUp to make buildings, you can export them and import them into Anime Studio, or just use the 3D tools to do the same thing in AS.