The coop we are building has a 4 x 4 floor and has walls 3ft high (roof makes it a bit taller). I'm wonderin if I can add a shelf about 14" up to be able to have 1-2 more chickens. I'll probably put roosts up there? As you can see the nesting box is attached to the side, so that frees up space too. How many chickens do you think I can have comfortably with this? What about Jersey Giant size, how many? I'm looking for full grown chickens, on person had Jersey Giants and I realize they will probably need more space. Thanks! I'm a newbie to this and will have many more questions.