ah ok and I didn't realize from your dwg that the cone is actually the filter element! The picture tells the story.
Regarding stabbing with cured CF - I fell your pain. I redid all the empennage fairings on my 4 in CF. I had numerous punctures. It hurts!
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2021