Just realized I never thought of something. Channel energy and constructs. I would think that constructs wouldn't be affected either way by channel energy. Is there anything that says otherwise?
Constructs do have a lot of immunities, but the information you need is under channel energy:
A good cleric (or one who worships a good deity) channels positive energy and can choose to deal damage to undead creatures or to heal living creatures. An evil cleric (or one who worships an evil deity) channels negative energy and can choose to deal damage to living creatures or to heal undead creatures. A neutral cleric who worships a neutral deity (or one who is not devoted to a particular deity).Constructs aren't alive or dead, so they're immune to either standard channels.
Even alignment channels won't work- as they only effect outsiders, or elemental channels, for they only work on elementals.