Wyn, this was early on in the build. I can send you some more pics tomorrow. I’ve git the floor plates pulled and can get you finished pics. One thing I’d do different is the floor plate. I did platenut it down, but I’d cut out around the nylon hold down blocks because you will be taking this off and on many times fitting things. The two piece floor plate would be a lot easier if it was in more sections. Your original question- I did have to cup out the flange on both to get full down on flap bar
I had my grandson print these flap rod fairings on his 3D printer. I covered the top with aluminum and a leather slit out. I should have printed the top also and then cut out the peanut shape for the flap rod. A piece of foam glued to bottom seals up around rod nice.