Someone was asking for more information about how the structure was put together, but I did not have any photos of the process. I did my best to sketch it out here.
Tomorrow I will make sketches for the roof, since that was a project unto itself.
disclaimer: I am not a professional architecht , builder or artist. This entire project was built from scrap wood and designed as I was building. The structure was based on the wood I had available. Given a larger budget, more time and some help, I am sure this would have been put together the "right" way.
Step 1: The Base and Floor
So, I started with a simple rectangle of 2x6, with cross-beams of the same. Simple!
Step 2: The Plywood
The back is two peices, since plywood is only 4ft wide.
Step 3: The Sturdy Frame
The sketch below has the plywood as invisible, so you can see how I put the 2x6's on. This frame is wrapped around the plywood box I built in the previous step.