Using glue to attach the slats is something I hadn’t thought of. I”ll have to look at that. My grille shell is a separate piece so water leakage wouldn’t be a problem. As for being strong enough you’re right it might not be strong enough. I had thought by attaching the slats to the rear of the shell it would strengthen it enough. But not having to cut it out would certainly be easier. I’ll have to take some of the slats I have and temporarily attach them to the outside. Your front grille looks great. I would like to see a close up.