Finished my new board design! My goals were to:

• Get everything on one board
• Space the switches so that they lined up with the lines on a half sized notecard
• Use an Itsy 32u4 as a microcontroller board instead of an arduino.

To do that, I switched almost everything to SMD and changed my input scheme to use one i/o expander hooked up to an 8x8 diode matrix instead of a bunch of i/o expanders. Here's a picture:

It ought to look like this: