There are three pressure relief holes, they also function as switch access ports for the two protons, the camera and deployment charges disconnect. They are sized a bit bigger than what is recommended to have a larger safety margin on pressure equalization.
The camera window sits flush with the airframe, should stay on sized it to have good amount of contact area with the coupler
The camera window sits flush with the airframe, should stay on sized it to have good amount of contact area with the coupler