Looks nice, simple to use and effective.
I like the RGB LED too. I think it is much neater than having 3 seperate LEDs...
I like the programming card but not so sure about the eraser card. I suppose if you have a small number of people then it'll be good 
Is there any way that if a person takes the outside box apart they can open the door? (Without the RFID tag that is), or is it only the antenna of the reader in the box? (and the LED) 
Mowcius