Shed design - Ideas wanted

I building a pier, and want to surround the pier and telescope with a shed.
It has to have enough room to move in and have a computer etc.
I have noticed that there are very few off the shelf sheds that could be
used and are secure enough to allow me to sleep at night.
I have seen a few sites on the net where they have built there own, but I am
still looking for ideas.
I looking at 6-7ft by 6-7ft. it the roof I am having fun with I rather not
have it roll off to one side.
Any ideas out there anyone wants to share that could help me.
Thanks
Steve

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