You are doing a wonderful job on this so far. Looks much better than mine at this point in the build.
I looked at the three prototypes that I built and could not quite put a handle on the seat back to pan problem. I am going to build this area again and will share the results here, for the better or the worse. I have built a ton of stuff and I know that adjustments are a necessary evil, I just hope the rest of the build goes smoother for you.