Except for some more fine-tuning, the chair is ready for glue-up and pegging:
I don't yet have the material for the arms, but they are pegged in place so I will install them after the rest of the chair is together.
Frankly, the last week has been frustrating. There are ten angled joints in this chair, four of which (the side seat rails) are angled in two directions. I made them as carefully as I could and each joint closed tightly on its own, but when I dry-fit the chair there were small gaps in some of the joints, less than 1/64" in all cases, but noticeable. Grrrrrrrr. Incidentally, I accidentally discovered that this is almost exactly the thickness of my fingernails. I have spent forever trying to close these gaps and am gradually getting there. The problem is that it isn't obvious which joint you should work on and what is holding the joint apart, so there is trial and error involved. In addition, each time I made an adjustment I had to reassemble the chair. Compounding the problem is that I made the joints very tight, maybe too tight, which slows down the process. These thick pieces of white oak don't flex at all, so the joints have to be very precise. Calling this chair sturdy is an understatement. It's a beast.
There is a Pendleton Wool outlet near me and I went there last weekend because I thought that it would be nice to upholster the seat with their cloth, which in Oregon is iconic. The heavy fabrics suitable for upholstery cost $84 per yard! I'm thinking about it but, at that price, the pattern will have to really grab me.
Despite the frustration associated with closing these angled joints, this has been a great project. I have come to realize that this is a chair that can only be made with hand tools, unless you scan it, make a CAD file and make a plastic one with a 3-D printer I guess. Trying to make all these curves and angles with machines would take forever, if it even could be done. The guys in the WPA shop were hand tool woodworkers, some of them very talented carvers, and they made a chair that showcases hand tool skills. Rectilinearity didn't interest them at all.