Don’t know where you live so we don’t know what your climate is like. Putting a rough location in your profile helps with questions like this.
You might follow the link in my signature to get some of my thoughts on room for chickens. I don’t give specific numbers, more things to consider. We are all so unique that one specific number is not going to cover us all.
If you build a reasonably predator resistant run then you have a lot more flexibility in managing them. What do you do if you try to free range them and a predator starts taking them? There are times I want to keep them locked up instead of free ranging. If you are not covering it all you are talking about posts, wire, and a gate. Make the gate big enough to get a wheelbarrow through, or if it is a big run your mower. I don’t have trouble with hawks either but raccoons, foxes, possums, bobcats, and others can climb. That’s why I don’t call an open-topped run predator-proof, but it can still be really predator resistant.
You can put the waterer and feeder bins up there if you wish, but think about how you refill them. Make it convenient for you. How do you handle water freezing in winter? That’s the kind of stuff knowing where you are could help us know what to ask or suggest.
