bees,
Iam sure that will work as good as with the insert , don't forget to enlarge the dihedral by 2x as mentioned on the drawing.
Please post some pics of your build.
Ton
Thanks for the pics Geoff the Sonny is looking great.
Sorry to see the tail is not strait will you try to correct that, or will you leave it like this.
You could submerge it in water and straiten it on the board and let it dry for a few days.
Ton