The next task for the firewall is fitting the recess that accommodates stuff hanging off the back. To put it bluntly, the fit of this part sucks – especially around the top. Apparently this is a common problem, some builders use a little “manual adjustment” with hammers and wood to improve the fit, others just do the best they can and accept a couple of sloppy holes at the top of the recess. I tried the manual adjustment route and had no success so I just drilled it in assembly with the firewall, making sure to drill from the side with the stiffeners so that those structural stiffener holes would remain unmolested. The result is a couple of slightly-egged holes in the recess, but it’s not structural – so I’m not gonna worry about it.

That finishes up, for now, the match-drilling required on the firewall.