Is that the coop and run....or just the coop?16ft x8ft
Am guessing coop and run is 8x16 and the coop itself is about 6x8....which is nowhere near big enough for 15 birds.
Why do you have 2 cock/erels?
What is your climate?
Putting your location in your profile can help folks give better answers/suggestions.
Welcome to BYC!!
Looks forward to watching your build progress.