I started off with this design but decided i wanted the exits of the horn to be more free on all 3 sides. So i switched to two pieces of wood and just let the metal grill be the binding part. Its a little wobbly but does the job. I inset the mounting bolts on the horn to be flush and then drilled 1/4in into the horn body and glued magnets into it/ wood piece. So it just snaps on and off with magnets, easy peasy.
As for the notch on the kick panels. I'll take off the cloth and do a layer or two fiberglass cloth so it covers the cut out part of the kick panel. I am just not going to bust out the FG material and until i have other FG projects to do at the same time.