I remixed this case to hold a nodemcu board and some associated connectors for a temperature sensor (ds18b20 in a cable gland) and water sensor. The water sensor is another 3d model and uses 18/2 connected to the speaker terminals that mount to this enclosure. You can find the water sensor puck in my makes as well.
I used 4 6-32 screws to bolt the lid on, some ebay speaker terminals (bolts in where the rectangular hole is) and some 6-32 nuts and bolts to hold the terminals in the box. I also used a NO pushbutton connected to the reset pin so I can reset the thing if it acts up... so far I have not needed to.