I've set out below details of the materials used and the deviations from the plan; some things only make sense when the rubber hits the road..... This is not a "how to..." - just a general description. Also, some of it may be unorthodox - but then again, I'm not a builder.
I designed the foundation section to sit just below ground. I hate digging, particularly in rock. Our back yard is pretty much river bed rock and excess digging was something I went out of my way to avoid. On the plus side, this same ground was going to ensure I had a solid foundation. I levelled out the area for my box, dug the corner post holes, built my box making sure that the top of the box was level from all angles and then set the corner posts in concrete making sure that the posts are straight.
The corner posts are 2.7m in length and not 2.4m as in the plan. The 2.4m posts would have meant that the structure would be too short and the likelihood of brain injury quite high. Thankfully, the inspector from the council agreed.
The second picture shows the base coarse after it had been compacted.
Continue to paving and frame
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