Instructions:
1. place a Foundation, can be thatch
2. go to 5-10wall high
3. Snap the template to your foundation
4. Thatch pillars should not be built or should be destroyed beforehand.
I tried to make the trap without needing that, but unfortunately the template failed.
Reverse engineering of the trap that appeared in the screenshot in the Ossidon trap video made by Qbell on YouTube ( at 2:02s)
https://www.youtube.com/watch?v=biBKslK0Pok