The first thing in creating is imagining. The best way for me to develeop my design floating in my head is to create a 3D model of it on the computer, so I made one in Google SketchUp, which can be viewed and downloaded also.
Here is a perspective view of it:
Those triangle shaped things between the top and the seat are the boundaries of the chains the seat will be hanging on.
The large grid-looking thing represents the rope net for the kids to climb on.
The detailed plan for the seat is under develeopment, so I just put a dummy in its place for now.