As promised, here are some sketches and photos attempting to illustrate how the living roof was put together for the Cob Playhouse I posted last week: http://www.instructables.com/id/Naturally-Cool-Cob-Playhouse/
I also posted some sketches for the structure of the playhouse here: http://www.instructables.com/id/The-Structure-for-Cob-Playhouse/
This instructable is for the roof. I did not take any photos during construction, so I have tried to makes some sketches and provide some photos that will at least give you the basic idea.
*disclaimer: I am not a professional builder, artist, or construction worker. I apologize in advance for my crude sketches and even worse construction skills. This project was done using scrap wood, many peices were already cut, so I had to sort of jig-saw puzzle much of this together.