I was recently able to find the complete storyboard collection that was included in the Blu-Ray release of Akira. Here is the reddit post that includes the dropbox download (100.46 MB):
If the thread has been deleted since this post please contact me and I will be happy to send you an exact copy of the PDF from this post! (I currently have it saved to my laptop).
Storyboard keyframes from the Akira Storyboard Collection (source)
note: These images can’t be found on the Blu-Ray disk under the name Akira Storyboard Collection- my best guess is that these images are from the book The Continuity of Akira by Katsuhiro Otomo, which from what I’ve gathered is the physical copy of those storyboards that had a limited publication and was never translated from Japanese.
Deleted Storyboards for the anime (source)
Exploring Akira 