I was trying to test fit the entire cowl tonight, but alas even the smaller K&N air filter hits the cowl and won't let it attach to the fuselage. I've tightened up all of the intake parts, so I'm really left with nothing to do but make a blister for the filter.
So I laid it out with a sharpie, shined a light through to see it and trace it to the outside, and then started building up modeling clay to create the blister. Once I get it shaped I'll lay down some plastic and do a fiberglass layup.