We learned a couple of lessons when we attached the back.
#1 – The 45 degree angle shown in the book for the back at the rear bottom didn’t really cut it. The cut needed to be deeper. That was pretty tough to fix once the back was already in place. For the second chair we were able to fix the back angle before we installed the hinges.
#2 – Hinges can be a bear to install. We temporarily attached the two ends with drywall screws which we drove in partially. After the other screws were in, we replaced those screws with the right ones.
-- Doug - When all you own is a hammer, everything looks like a nail.