Brian - I would not like to travel long distances in something with dimensions like a Cessna 150 at about 36".
Ken - I have yet to notice anyone "highly suspicious" on this group about anything. +++++++++++++++++++++++ I have seen Ron post a few times and 3 or 4 Steve's but never seen another Steve J - did not now there was another?? The question is a very valid one, I spent a great deal of time reading various builder reports on exactly this topic. On my plans the fuse is 38.12" at the widest, unfortunately this forward of the shoulders. At the shoulders it is about 37" at the top rail of the boat. That is the outside dimension, so deduct 1.25" (2 x 5/8") for the top longeron and doublers, thus an inside dimension of 36.75 - 1.25 = 35.5 (at the rear spar / shoulders). After reading a great deal of comment from netters, I concluded that I could safely get away with anything up to 44" outside, plus move the wide point back to the shoulder position. That is 5" more than the older C172. As someone else commented, you can customize the seats to suite your shape, age, posture etc. and end up with a very comfortable airplane. You could even modify the seats over time until you find exactly what you like. I am sure that the popularity of the KR stems from the fundamental simplicity of design and materials - it really is easy to customize. It may not always be safe or even wise to do this, but it is easy. Many builders stretch the boat - I think I have read about another 14" onto a 2S. Apart from the other benefits, this helps to accommodate the extra width in softer curves. At least Mark L and Don Reid discuss this (and other mods) on their respective web sites. Steve J Zambia