it looks good, but ultimately your ventilation needs are gonna be dictated by the number of birds you have.Would this be enough ventilation?
generally, you want at least 1sqft of ventilation per bird.
it’s best up under the roofline for a few reasons. first, it’s more easily protected from the weather. and second, the heat and ammonia from your chickens’ breath and poop will rise, so ventilation up high is good.