Crazy what you can do with patience and autostitch ! Both picture here are made of 30 something picture. This are the “max flickr size” version so that flickr can do the thumbnails (max 15000px wide). I uploaded the originals too. They are 19800 and 22800 px wide, but have black thumbnails. Maybe someday I will dislplay them on a lot of screen using displayator.
In flickr, picture with one dimension >= 15000px (or an uncompressed size >250MB) will not get miniaturized. Miniatures will be replaced by black placeholder. It seems to be a longstanding known bug. I found a 18month old thread about that bug on their forum.