If the 6x6s are at 45 degree angle, with the hammock line coming out at a corner of the square post, rather than just out from a flat surface, it'd be better. Excellent points about height and distance relationship, BW and J. Opie put his posts 15.5 feet apart, so that's a thought. I would like to know the height of J's when you geta chance with the measure. I may be going with a plan like yours--30 inches down, a three-post design, and 6x6s from HD or Lowes. Thanks.