When I first saw one of these hanging fire pits, sometimes called a porch-swing fire-pit, I just knew I had to build one. I had a large level area in my lower back yard that was a perfect spot. My kids are a little older now and like to spend time outside with friends, so I knew it would get plenty of use. It does.
A gentleman that goes by the name of Chenango Dave on bowhunters.com provides a basic tutorial, but I wanted to build a structure that was a little larger. I'm sharing the details here for anyone else who wants to build one. I might not include every last detail, but I'll try to include all of the important bits and throw in as many tips as I can think of.
You will want to start with a level area that is maybe 5 feet larger than the structure you intend to build in every direction, or about 25 feet across if you stay close to the dimensions here. If it isn't perfectly level, that is OK, but you will want to level it AFTER you build the structure. It makes no sense to level first only to have to dig deeper holes for the posts.
In my case, I had a giant old swing set that I built about 14 years ago when my youngest daughter was born. Thanks to Craig's list, it was gone in 3 days and I got a little cash to use towards this project.
Keep in mind that, depending on where you put it, this structure can be used year round and it will only be used with a fire for a fraction of that time. My teenage kids wander down to sit on the benches during the day with their friends and sometimes even go down there just to study or read. Fortunately, we have trees to create both morning and afternoon shade, but no trees immediately over the fire pit.
So if possible pick a spot that gets shade for much of the day but it cannot have tree branches directly overhead.