One of Chaos' most distinctive things is it's daemons, and of course -- Daemon Engines! I have loved daemon engines since Epic, where my squadrons of Towers of Skulls, Death Dealers, and Cauldrons of Blood where the bane of all that lived (at least in my gaming group). Currently, outside of Apocalypse, the Defiler is the only daemon engine out there. So, who wants to add some in? I'm focusing primarily on the old Epic ones, myself, but I don't see the need to limit ourselves. I think many of those can be shoehorned into standard 40K, though some will have to be Apoc.