Woah, nice! Thanks, that's super useful!
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Thanks! This was a very helpful tutorial! I've been trying to figure out how to set these regions with the GUI for days... I'm so glad I saw the Texture Region panel now.
Also, another handy feature I just noticed (which is very helpful for this particular workflow) is bulk edit in the scene node-tree panel. You can just select all nodes, then drag the sprite sheet PNG over from the resource panel into the Texture property dropdown.