After more than a month layoff, I started today by re-verifying the hole spacing for attaching the F-367E seat back hinges to the aft seat floors. I have read in other builders' logs that they had issues with the rivet shop heads interfering with seat rib flanges. After double- and triple-checking, it does not appear that the dimensions called out on DWG 30 will cause an issue. All hinge rivet holes are at least a half inch from the rib centerline.
I carefully laid out and drilled the hinge to seat floor holes to 1/16" in one hinge, then used that hinge as a template to drill three more hinge halves before I ran out of time. I will drill all of the floor half of the hinges before match drilling to #30 in assembly with the floor pan.