Adding Chickens to Duck flock

[Doodleloo]

Hi everyone!
About a month ago I adopted 2 adult female Muscovy ducks from a duck rescue here in Texas. I'm obsessed with them. I now have the very exciting opportunity to add 2 adult hens to my tiny flock, both actually from the same duck rescue. One of the chickens has a shattered leg but has been taken to the vet who said she's actually not in pain with it and can still get around fine on her one leg so they recommend to let it heal as is. I'm adopting her because she cannot safely free range there anymore because of other chickens attacking her. She is coming with her sister who she is bonded to.
So with that provided, I'm wondering if anyone can advise me on how to accommodate the chickens in my duck coop and run.
I have a coop built from the bottom of our kids' play set, and it is open to the 360° protected large run. The run actually has hardware cloth along the entire floor as well, with layers of oak leaves on top, and some grassy areas. I know that inhibits chicken scratching but they will be let out everyday to free range the yard. Is that ok?
I have a poorly constructed (but does the job!!) nest box for the ducks, and they sleep there together at night.
Do chicken nest boxes need to be raised? And they need a roost, yes?
Any and all advice is so appreciated! I am so so excited for this next addition!

 

[AmeraucanaHank]

One of the chickens has a shattered leg but has been taken to the vet who said she's actually not in pain with it and can still get around fine on her one leg so they recommend to let it heal as is.

do you have a video of her?

 

[Doodleloo]

do you have a video of her?

I did see a video of her, she really doesn't look in pain at all. They even gently touched her near her leg and she didn't flinch or move at all. And she was eating

 

[AmeraucanaHank]

I have a poorly constructed (but does the job!!) nest box for the ducks, and they sleep there together at night.

I think your coop is cool!

Do chicken nest boxes need to be raised?

No, not necessarily but they do prefer it to be raised.

And they need a roost, yes?

Correct!

I know that inhibits chicken scratching but they will be let out everyday to free range the yard. Is that ok?

I think so, but do you have a place for them to take dust baths?

 

[Doodleloo]

I think your coop is cool!

No, not necessarily but they do prefer it to be raised.

Correct!

I think so, but do you have a place for them to take dust baths?

Thank you SO much for your reply!!! I have a sand box does sand work?

 

[AmeraucanaHank]

I have a sand box does sand work?

It probably would, but fine Sand and Dry Dirt is the key to a good duct bath for your flock. Fine sand mixed with some dry dirt makes a great base on which to build your chicken runs dust bath.

 

[Doodleloo]

It probably would, but fine Sand and Dry Dirt is the key to a good duct bath for your flock. Fine sand mixed with some dry dirt makes a great base on which to build your chicken runs dust bath.

Thank you for your help. I've given them a separate kiddie pool with dirt/sand/diatomaceous earth

 

[AmeraucanaHank]

diatomaceous earth.

It's great that you put in diatomaceous earth! It's no fun dealing with poultry lice!