This guy has a lot of great ideas that are sound and inexpensive. I have watched his videos a few times and would love to build one of these someday. He has plans for bike shelters, homeless shelters, watercraft... I felt I needed to pass this information along. He is Paul Elkins and he sells his plans, but you can get them free I think too if you can't afford to buy them. Here is his website:
http://www.elkinsdiy.com/stationary-shelters/
This is the latest video I have seen and he pretty much thinks of everything with this shelter IMO