Easy enough to convert from plastic bulls with some extras and green stuff. If you struggle let me know and ill do them for you
For my 2 I bought one full butcher then just got the second as a body and used the alternate parts from the 1st
not sure how viable that is now that gw don't do that many bitz any more 
Made the boom stick (can't remember the actual magic item name) using I piece of sprue for the stock, plastic tubes for twin barrels and the top of the lamp from the mordhiem/militia sprues.
When doing your gore to show the blood magic he is using, mix in a little sand and static grass to your paint on the palette to make it look like gristle and hairs.
Don't show too well in those bad pics, will get some clearer ones at the weekend.
Hope that helps a little
