Since I’m producing as close a copy as I can in this instance, there are no design requirements to consider. To recreate the chair, I started from known dimensions (45″ h x 14″ w x 17″ d) and catalog photos, lofting dimensions to determine the measurements for the parts. Having determined dimensions, I created a 3D model in SketchUp. For some projects I’m content to draw a rough design on paper, but a full-sized computer model can show how parts relate to each other. It’s also useful for creating patterns and visualizing how parts fit together, a useful capability when dealing with unusual angles and intersections at play in the hall chair.