From my video:
Print with 0 top layers and 0 bottom layers and adjust the infill pattern and percentage for your desired mesh appearance. I STRONGLY advise against printing it solid since that thing struggles enough for air as it is. The brace bar is not required but adds a tiny bit of stability. Assemble using M3 threaded inserts and screws. Check the video if you need a better look at how it goes together.
This is the cooler I used. I wouldn't exactly recommend it since it's just the first one I tried and it might be crap, but it's at least guaranteed to fit with this lid: https://www.amazon.com/dp/B0CY274JWV
The author marked this model as their own original creation.