The posts were sunk 50 cm and set with a cement collar. The ground by the creek is permanently softer and wetter and will need some shoring up, but for the moment they´re plumb.
The wood is green chestnut we got from a place in Palas de Rei. It´s very heavy. We´ll wait until next Spring/Summer to put on a finish of some kind.
Now, I hum the Dallas theme song every time I come home.