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I didn't create it from scratch (there were no test subjects), but there were cases where I had to adjust part of the geometry myself, for example, the old knight from the FEM mod – the book was in a different position, and I adjusted the head and other minor details myself, while everything else is the default knight.
Added 1 minute ago
The original model of the old knight has a completely different skeleton, and it's unclear why it wasn't unified with the regular one.