Thanks for your helpful suggestions! I sanded off some paint and am using wood glue to try to assemble my chair.
I tried to use my new MicroMark gluing jig. It hasn't been much help with this project. I am using a little level to try to get things straight. I'm waiting for the glue to dry on these pieces before I continue.
This is a fine mess I've gotten myself into! I had the idea of building these chairs on December 31st! I never figured this would take so long!