Excellent idea. I've been toying around with different ideas. Your idea sounds like a quick solution.
I am planning on building a shed from Royal Outdoor Products "Winchester" storage building panels that I got off craigslist for no charge. The shed was hit by a tree and the owner just wanted the remaining panels removed. Most parts just need a good power washing to be acceptable. The size is right and the color matches the house and deck. I have some metal panels that have exhaust holes in it for the rear of the shed, so it will vent and not melt the plastic.
I don't have the front doors, they were destroyed. I was hoping to work on it for the spring of '12..... LOL now maybe this spring???
There is a picture of the shed before it was knocked down in the storm at bottom of my review page