They look great - definitely a work of art and they should be a deterrent for a smash and grab theft. I would have gone with very visible locks though - so that it is obvious to the would be thief that they can't open the door by smashing the window.
I think these area great idea
I have also wondered about security since we will be travelling around the world in our truck. One thing I learn when living in Africa, is that if people see something with loads of security, they assume there are lots of valuable in it. If someone want to break into your truck, they will - and if you have sorted out the security on the front window, they will just cut the windscreen seal and pull the whole windscreen out, failing that - just use a crowbar on the screens or doors, windows or roof hatch.
My own experience is that if you make it too difficult, they will just wait for you to open the truck, and then hold a knife or gun to you and steal the whole truck which is a whole lot worse. Car-jacking is a major problem in South Africa because alarm system are so good. To make matter worse, that some thieves now have a habit of killing the occupants because if they let them live, the owner can make a phone call to activate the remote security/satellite tracking before the thieves get it to their workshop and strip out the security.
There are basically two type of theft - one of opportunity - like leaving your cameras, gps, ipad on the dash board. Someone will see it and "smash and grab. Easiest thing to do is have screens that prevent people from seeing into the truck, and keeping everything hidden. The other is someone who is after you or your whole truck. If you are worried about getting robbed in a remote area when you are in the truck overnight - things like high power lights that come on when someone stands on a step to look into a window and alarms etc that wake you up is the best you can do.