@joseph – I hope it’s OK to post this here. Please tell me if it is not.
Here is a Sketchup model of the dining chair. Please let me know if you find anything incorrect or missing. My Sketchup skills are intermediate – I’m still not able to generate curved objects in two dimensions, such as the backrest rails. This model does not include any of the final leg shaping, but it includes all joinery and general layout. For those of you who are new to Sketchup, click on the “scenes” (shown at top of my screen (below the menu options), but could be different location on your screen. They start with “Overview” and continue with “Side View”, Back Leg Inside View”, etc. These will give relevant dimensions.
Matt, Northern California - Started a blog in 2016: http://tinyshopww.blogspot.com/