My project is almost finished! Today I made some subtle changes to the PCB. More changes were made in CAD today. I know I’m a CAD noob, so I took quite a while to do some simple things :>
This is the result of my work today:

I moved the SD card slot because I was scared it might not fit into the case. I also made some space for the Picos USB port.

I added space for two M2 screws at the bottom of the case!

I also added a hole through which the on/off switch can be used.