ok a word of warning when building a shed duncan, make sure the ground is solid and there is no top soil 1 metre under the foundation...
bit complex in our situation, but it has caused major problems and headaches, and it was the bloody councils fault
we have pretty much had to dig around and under part of the foundation fill with concrete and place a bit I beam in there to support....
but anyway enough of that, our shed is a quaker barn style 2 storey(upper level is a self contained unit) single roller door, 3 car with a pit, engine chain on a roller, still comming along but its gonna be good.