Devon: Are you sure it's a chain golem on the picture? I Downloaded the MM2 Web Enhancement (The one with the addition to the Haöf-Golem template.) and it made no mention of half-chain golems.
Yeah, this was actually in the Artwork section, not in the Web Enhancements section. There are no stats on the website, so I won't know how close it'll be until I look at the printed book.
No worries, Krishnath -- it's sometimes hard to find things on the Wizards site.
As for the half-Chain Golem, I imagine it would resemble a Kyton of some sort, except with chains coming from its forearms.
In fact, it could easily be something an evil priest/Master of the Chains, worshipping such devils, would have created.
On the other hand, a Chain Golem wouldn't really be a Golem in the traditional sense, since Chains aren't a pure element -- I mean, they are purely metal, but they don't have the elemental purity of Earth, Flesh, BOne, et al. It's weird. I'd put them more in the category of Automaton than a pure Golem. Im really on the fence now that I've thought aloud about it.