Cleon said:As for its immunity to weapons, I think I'd convert that to a Stone Golem's DR 10/adamantine.
For that matter, I'd turn to the SRD Stone Golem for the basics of the "Tomb Warden" stats - e.g. take a Stone Golem, reduce it one size step to Medium (for Str 21, Dex 11, NA +16), cut its HD to 11, give it a single 2d8 slam attack.
I agree with your assessment on using the stats for a stone golem as a start. As you already know, I strongly dislike the immune to natural defenses. We'll see what freyar's opinion is.
The CC version doesn't seem to have an equivalent, and I don't have my ToH handy.Statue (Ex)
A caryatid column can stand perfectly still, emulating a statue (usually one that is holding up the ceiling, like a carved column). An observer must succeed on a DC 20 Perception check to notice the caryatid column is alive.