Finished CAD!
I finished the CAD for the enclosure and got everything assembled in CAD. Luckily everything worked out! :D Might’ve put too much space for the SD card on the PCB…

I also started working on the firmware. Originally, I wanted to use Arduino IDE but it might not be the friendliest for the Pi Pico. I plan on looking into circuit python to see if it is better for reading SD cards and playing audio.