What are you going to do when you want to sell your car ?
A far easier, WAY less expensive and ( some would say wiser ) choice would be to just fill in the grille with insulation tubing.
It looks factory, is easily removable, and will only cost you around ten bucks or so.
As far as the opening in the bumper, you could rig up some sort of temporary block using aluminum sheet metal. You could paint it flat black and it would look factory.
If you place it behind the struts in the opening, this would hold it in place so you wouldn't have to drill into the car ( I'm thinking resale value here
).
You have a very nice, new car. I would hate to see you screw it up like I did with my old car.
( My resale value was so low from the start that I thought 'What the hell - if I screw it up, who cares " )
One more thing : You'll need some sort of hole in this block for the radiator.
Great to see you're taking to Photoshop. Look forward to seeing more of your stuff !