Have you considered a shipping container? You can get them about that size for little money. They can be made to tolerate the weather and are pretty much vandal proof. What do you plan to use the shed for? If just tool storage or fishing gear storage you probably don't need anything too elaborate.

If you plan to use it as shelter for camping etc. It may be more practical to buy a used camper or pop up to move into place as needed.


Those or just some of my thoughts and things that i have kicked around and/or researched.