I recall a documentary I once saw about a wealthy gentleman who used his fortune to combat crime in the city of his birth.
A moving testament to a truly courageous and resourceful individual. In the truest sense, incredible.
He drove a car of immense power, which he was able to cover with an armoured carapace at the touch of a button.
Whether he had taken out a patent on this system I do not know. I suspect he had, as I have yet to see it used on another car.
Anyway, his design seems to have more than a little in common with the system you describe.
It might be worth tracking this chap down and seeking his advice.
I forget the name of the documentary, but the gentleman was a Mr Wayne.
I hope this has helped.
I think you'll find those only work on dark knights