They just don't seem that Unholy to me, unless we're going to change them to Outsiders. I'm not even sure why they'd be CE if they're Constructs, to be honest.
Abilities: Int is 2-4. Wis, Cha probably 10-11. Str you'd think would be low, but some of its attacks would do better with decent Str. I'd probably go with 10-11 there also. Pretty high Dex would make sense; anywhere from 12-17 works for me.