Very good boards, but could be improved by breaking out the following pins;
pin 33 is connected to onboard signal led, I've repurposed this to connect an ldr as light sensor, but it would be easier if this was broken out
EN pin should be broken out to enable auto flashing from USB and for external reset button, as onboard reset button is very fiddly. I repurposed vcc pin for this.
Very good boards, but could be improved by breaking out the following pins;