Electronics 2000

Hello everyone, my first post here so be gentle with me.
I want to recreate the rolling numberplate as used by JB on the Aston Martin DB5; I have seen flipping plates on ebay but I want to create the Bond look which incorporates 3 number plates on a central pivot.
SO...any suggestions from you creative geniuses as to how to get the motor to take the plate from locked position to the next plate?
Disclaimer: I know it is not legal and will not be using it for any other purpose than displaying at a show etc.

Okay, update
I dont know whether this is right but by way of experiment I have purchased a 12v 2 phase stepper motor with 1.8deg steps
How do I now program the control
Thank you

Do you have any spec on the stepper motor ... any links etc.

Well actually after a bit of information from a supply company its too complicated for me as I am not equiped with the arduri and control software
So, I am going to go the relay drive route.
I would be grateful if someone could assist with this though
The triangular hub needs to turn 120degrees and hold each time I press a switch, any ideas?
Thank you

You can probably do it using a clock pulse driving a counter and a stepper motor drive, when the counter expires it switches the stepper motor drive off. When the button is pressed it enables the drive and resets the counter. A bit clumsy as you'd need to also inhibit the reset button whilst in motion.
My personal way would be to use some sort of normal motor and limit switch. The limit switches connected to a cam or optical limit switches (like an encoder) looking at a disk with 3 holes in it, much simpler and you get the position correct every time.

Need to know more about the motor... but digi is easier than relays... press the button and it counts the number of pulses needed to turn 120 degrees. You dont need software just a chip or a few chips and a button...

What aboul LCD?.. is it legal I wonder... could do with one myself.