Used a countersink bit to bevel the bottom half of the piano hinge holes. Repeated the assembly process for the pilot side hinge and top frame. Then disassembled, deburred, treated, riveted the hinges to the top frame tubes and riveted those assemblies to the top sills.
Finally received my prop, spinner, and hub from Viking along with a fuel check-valve assembly. Also received a missing steel tube from Zenith for the tow bar installation. I could switch to those items, but I think I'll get the door frames finished before going back to those sections.
Top door hinge riveted to top tube with center hinge pins