Model Hitbox

Hello, how i can define a hitbox and more for this model? I want to say that the player cant go through this model.

You'd have to adjust the hitbox in the furniture config, check here.

Okay, thanks and how i can disable the break for this custom model?

You could always protect the small area with worldguard, but I'm not sure if there is a specific config option that disable the mining of it.

I know they have blacklist and whitelist options if you just would prefer to not use worldguard.