This is my Cedarbilly Cabin 12x16 Design that people might like. It is based on an Adirondack style with loft that extends over the door to create a porch.
Could be built for under $2000 and has lots of room for a single person or couple and even room for kids.
http://www.youtube.com/watch?v=30C3wEQx6Hc
Enjoy!
LaMar
