I have a question about the LEDs. Did anyone manage to route the LEDs to the top of the case yet? I find it awkward to have them under keys that have no relation to their function.
I had the same inclination, so this may be relevant to your interests:
I'm thinking of swapping the switch-mounted LEDs with their resistors -- i.e., putting the LEDs where their respective resistors would normally go (just to the left of the Teensy) and vice-versa (most likely putting the resistors on the underside of the PCB and soldering them same-side). They're series circuits, so I think it should work, just gotta take care to maintain proper LED polarity (I gather the + leads should point towards the Teensy), and of course some creative bending of the leads will be necessary to accommodate the solder pad spacing on the PCB.
Another approach I'm considering is leaving the LEDs soldered where they would normally go, but putting them under the PCB (rather than thru the switches) and leaving long enough leads to bend them over to the left edge of the PCB, so when illuminated they would shine into the left edge of the case.
I've started soldering up my ErgoDox and decided to go for swapping the positions of the LEDs and their resistors, so the LEDs will shine alongside the Teensy. However, I ran into a bit of a snag due to poor foresight on my part, as I'd bent both legs of the LEDs in such a way as to center them between their respective pads and soldered them into place that way; then, only after I soldered the Teensy in place, did I realize the 2 LEDs closest to the Teensy stick up too far, blocking me from inserting the stripped USB plug into the Teensy, and even if I could, those LEDs would wind up buried partially under the USB plug and its leads.
Now I'll have to desolder those and get 2 new LEDs to replace them, this time inserted so the negative (longer) lead goes straight down into the PCB pad, and only bend the positive lead to reach the other pad closest to the Teensy. I can't just reuse the original LEDs, as I'd already clipped their leads down to size after soldering, which leaves the positive lead too short to reach its pad if I wanted to reposition them.
Also nice to see someone went with the approach of putting the LEDs under the PCB and shining out the inboard side, but putting them on the left hand was a nifty twist on that idea!