Yeah Hashut is the Chaos God of Fire and Bulls are his sacred animal. Supposedly 11 is his sacred number but I don't know much about that. It's postulated that he was a particularly powerful Greater Daemon of Khorne (ie. Bloodthirster) and was imprisoned underground by the God after Khorne got jealous. Ages after, when Dwarven miners were delving after they had been cut off from their kin in the south, and well, west I suppose, they accidentally released him, although they soon realised that through him, they could gain more power than ever before. Through the way that Gods work in the Warhammer world,, Hashut therefore gained enough power to become, more or less, a God, simply through belief.
What this doesn't explain is why Chaos Dwarves have Sorcerors, as Khorne and by extension, his Daemons are diamterically opposed to magic. But anyway, that is supposedly his backstory. There is actually quite a lot of backstory about him on the internet, so its pretty easy to find fan-made stuff about him.
As far as how they're being made, they generally have Dwarf models I believe, but they definitely have their own textures. It's part of what I'm doing. But I'm not doing them bright red and with big hats like the old stuff. I'm basing them more or less from the Hellcannon crew, so dark chain and scale, burgundy cloth and bronze helms.
