Generation occurs from Y=3000 to 5000. Recommend entry from topside around Y=5080.
License, free for non-commercial and educational use. Please contact me for commercial use.
Screenshot: (sorry, too big file. Will have to edit and repost)

Tar file:
https://www.dropbox.com/s/9vs11qz46hqfu7u/stackfrac.tar.gz?dl=0
Zip file:
https://www.dropbox.com/s/i9gn53i1cigs44n/stackfrac.zip?dl=0