By looking over your design I picked up on one important point I like. The vent hole. Like the feature. I had assumed that the switch would just blow out the butt end, but a sure fire vent is even better.
Maybe a hole through the switch housing, but outside the area of the switch itself would be cleaner.
Keep up the good work, nice MOD.
The green LED should be one of those flashing LEDs. You could leave it on the bar while you went to "vent some beer" and no one would take your seat, or the seat next to yours, or the seat next to that - - -
Rocket