Took everything apart last night to re-route the wiring and clean things up. I drilled holes at each potentiometer to route wiring and drilled a central hole for button wires. While I was at it I spent some time with the various sanding tools and tried to remove some of the tool marks from the aluminum parts and just generally clean things up a bit more. I also added some bronze sleeve bearings to my 3/8" pivot shafts to shore up the springs a bit and try to eliminate a squeak I was getting during movement.
Here she is back together:
Close up on wiring, in lower light the red LED from the Arduino sends a glow out of the center hole
Another shot
The bearings are working great. Movement feels smoother and no more squeaking. It should be better on the parts too, the steel spring rubbing against the aluminum shaft was probably not the best idea. I also installed some proper set screws on the shafts as well, at least for the potentiometer. You can see I'm still just using the 4-40 screws as set screws to hold the pivot arms in place.
I was going to pick up some right angle headers to do the wiring hook ups, but I was impatient. I soldered leads directly to the board instead. For ground and vcc I soldered a short jumper and then soldered several runs to that.