I guess we need to think about covering access to food at night for now, in case of mice and to not attract other critters. The courtyard is meant to be a feeding/watering/scratching food court, as well as extra square feet.
I guess we could get two PVC caps, and cover the vertical food dispensers during the nights at night and morning when we manage the pop door... just in case some mice get through the hardware cloth or a crack we're not aware of somewhere. But eventually, we thought we would leave the pop door open.