When I used satshakit that I have build In another extra-project I found 2 points that was disturbing for me.
I will add few points to current schematic of Satchakit to have possibility switch it from simple external voltage (mostly 5V) to 3.3V. and I will add the output VCC and GND pins.
As well I will add global GND to increase surface of ground field.
Let see what it be
Standard preparation for Rolland SRM-20 and milling. Images for holes, traces and cutout are below