I do not know what you are actually up to but from what you are saying it sounds like a good project.
The Rat Shaq LED 12V Indicators will work OK, but may be too brights; the only limiting factors is the depth of the area you have.
Go to a Rat Shaq (Radio Shack) and look at the indicator lights their might be one that will fit as is, like a mini 12V LED.
OR use one of these for each LED, LED Holder - RadioShack.com
, you need one of these, a lock ring, an LED of the correct color and a resistor to use the LED at 12V, for each indicator.
Very low space requirements.
Best thing to do is check them out at the store or any electronics store.
If you were closer I could do this for you but Cali is a long way from Boston.
luck to ya, I am off tomorrow for vaca for two weeks so if I do not reply it is because I do not have access to the internet.
ltr and luck with the project.