I will have to look when I get home to refresh my memory. I know that on the upper inside lip of the
oil cooler intake there was a shipping screw to the tube frame, that I riveted after bonding and added another rivet on both sides - 3 total. I can't remember any inside the grill area itself right now - I will need to check. I don't think there is any steel structure immediately around the radiator grill opeing except down at the bottom over the
oil cooler opening. Amazing how the memory fades after 4 years.
You aviation guys are probably over-qualified to build one of these. You will be 3 years just drilling out and safety wiring every fastener on the car. (just kidding)