Trimmed the spinner front plate to fit around the prop. Got a good fit, much better than the old front plate that came with the prop. Also discovered that the spinner that came with the prop is a 13 inch spinner that fits perfectly! Began building the airbox. Filed on the mount plate until I got it to fit around the accelerator pump on the carb. Installed the lower cowling several times unitl I was able to get the airbox intake lined up with the scoop on the cowl. Drilled the intake top plate in place and installed the nutplates and filter retaining clips.