Thanks for your helpful advice and pictures Tom. I believe your earlier post about the seat rail joinery to the leg was deleted by accident by the site but it helped me greatly. I see what you mean about the round over on the crest rail. Gene's Fine Woodworking article did not have any pictures of the back, so I look at Tony Kubalak's website and he has several pictures of this chair. He is a phenomenal woodworker. His rail is more square than Gene's, and in fact, is much more finished in detail. I tried to reproduce that version. I am not sure which is historically correct, but Gene was usually the final word. Maybe there were different versions of the back of the crest rail. Perhaps this calls for a road trip to Winterthur or the Philadelphia art museum. I believe there are about 4 of these chairs around. Thanks for your positive feedback Tom! Your plans were so helpful. Mark