This is a simple case for the 16x Relaycard with the ESP32 microcontroller found on here:
https://aliexpress.com/item/1005007724505151.html or
https://aliexpress.com/item/1005007519511692.html.
I've included a model of the PCB with most of the relevant parts, used for building the ase around it.
No supports needed.
I used three small wood screws to close it.
The author marked this model as their own original creation.