Cleon
Legend
Ok, I still wasn't sure if we're doing a template or monster.
It might make sense that "real" beholders force lesser beholderkin to pilot these things, anyway, in which case a monster treatment could make more sense. We'd just need to decide on the overall power level.
At the moment I'm thinking of them as something more monster and a template. They're built like a monster but are directed by their beholderkin pilot, so use the beholder's mental stats.
I suppose they could use some of the beholderkin's others stats (Skills? Feats? Saves if better than the golem's?), but the beholder may be unable to precisely control its movements, due to the vast difficulties in their anatomy. i.e. the beholder would mentally order the golem to "lift that bale", but it would not be like the beholder is possessing the golem's body and using its bale-lifting skills and feats.