ugh... hood scoop projects. I worked on my hood scoop last winter and it took forever because the fiberglass & finishing work was endless. I went with a WRX reverse hood scoop for heat extraction (like yours) & ended up Line-X-ing the hood insert to give it a finished look.
I've always liked your hood scoop but a little width will be a nice touch. I'll be interested in seeing the final pics with it mounted to the hood insert.