'Geralt the Centaur' by modder errornoaccess is a thing that I came across on the Nexus and immediately started checking whether I needed to uninstall anything to make space to stick TW3 back on ...

It's called 'Herald of the White Frost' and it's by modder errornoaccess, who also made the mod that lets you run around as centaur horse-man Geralt which I had a fun few hours with back in November.