his speed (including climb speed), AC (does the NA stack or be replaced by the Half-Golems?), full attack, rend, wound, his ability scores (modified as they are for Half-Golem and Effigy).
Lose the feats Alertness and Toughness as they are not combat related, lose Low-light vision and scent. The special qualities berserk, DR 10/silver, haste, immunity to piercing and slashing weapons, magic immunity.
This seems correct. And whether the NAs stack depend on the half-golem template, but the effigy NA stacks on top of whatever the NA of the half-golem ape.