Looks good, man....
I have a dual myself, but one of the readouts doesn't work all that well (the numbers are very, very dim (I've replaced the battery).
So, having one good one, and a desire for a joyport on the front of my rig, I did something very similar to yours, but instead of the 2nd LCD, I cut a hole for the socket end of a joystick extension cable.
Works good, looks good, but the Superglue I used to hold the cable to the cd-bay cover plate didn't hold....need to re-glue it.
That's a great idea on the on-off switch. I don't run 24/7 either, and I'd like to do that myself to save on the battery. Eventually.......
Great job on that! Bet it looks even better installed.
Mr B