This awesome step stool converts into a chair. Here is how to build one.
This is a link to a Google 3D SketchUp drawing for a wooden deck chair. You will need the SketchUp software to download this drawing and its freely available online. A wood folding lounge chair with armrests.
At this link you will find American Woodshop with Scott Philips as he walks you through the process of building a two seater Adirondack Chair. Visit their web site, then click on Season 17 and look for Episode 1709 to watch the video.