This is a very simple case for an ESPHome DNSK-P11 replacement module. The module can be ordered from https://www.espthings.io/index.php/2021/08/03/panasonic-climate-wifi-interface-for-esphome-and-home-assistant/
While a custom case isn't strictly needed (as the module fits in the original case), I designed this very simple case, so I could leave the original modules untouched. Users that might not have the original DNSK-P11 modules might also want to print a case like this.
Print instructions
Assembly instructions:
The author hasn't provided the model origin yet.