After talking to Olly over what he was after he came up with this design:
From that i have made this:
It might a bit too round but the pipe shapes are the same atyle as the picture so hopefully itl be okay. I think it may be worth squashing it in a bit or making it a curvy square at the base.
Maybe a bit more like this? I like how theres a definite point for the shed to attatch onto, maybe add a couple of more pipes towards the bottom but otherwise its getting there and does look nicer than the previous two.