hello, since you will be passing cables through the engine bay to the inside of the car anyway, wouldn't it have been more easy to simply use a metal cable on wich you push-pull from the inside to open or close the grill? you could recover that from an old bicycle's brakes.
that system has always been widely used in cars, just think of the accelerator pedal or all the buttons that controll the airflow and heat... would be more ecological aswell i suppose.
anyway, that thing of yours looks quite heavy and powerfull, make sure it can't put stress on any non-moving parts. or it seems like if the grill was obstructed, that it could tear up the front of your car lol
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