My first hut was this:

Made from recycled material. It lasted 3 winters but it was very heavy and it took a lot of space to deposit during the summer.
My next one was this:

Still 4'x4' and 8' tall. Lighter and easier to assemble then the last one, but still overkill.
My next one is a box 2'x2' made from corrugated plastic at the outside,
http://www.homedepot.ca/product/white-c ... nch/924856
a 2"x2" wood frame and 1.5" insulation:
http://www.homedepot.ca/product/durofoa ... nch/940442
I don't have yet pictures of it, but it's very light, can be easy assembled by one person.
Inside the palm is wrapped in arbotex and Christmas lights on tc3. I added also a very small heater on tc2 and a wireless thermometer so I can monitor the temperature from inside the house.
At the outside everything is wrapped in white tarp.
Tavi