I think one would have to build according to the length of the hammock and chains. My hammock requires at least a 12' spacing between posts. It is a Mayan type - no spreader bars. The angles are 40's and 90's.
PDF Downloads As a Pro member, you will gain access to download any Instructable in the PDF format.
You also have the ability to customize your PDF download.
http://www.hammockforums.net/forum/showthread.php?t=52945