I am almost half way done... with the diodes only! I have to say, soldering service is going to definitely worth it. for each diode, you pick it up, bend the legs, insert each leg to a hole, in the correct orientation, do that for 86 or 87 times (or 100+ for 7bit layout), then flip it over, and solder both legs for each diode. Oh, and you are supposed to cut the legs before your solder. Do that 86, 87 times. Then you can solder the Teensy, then 86, 87 switches, each have 2 solder points...
I now appreciate 6KRO over USB/NKRO over PS/2 much, much more.