Wow, lucky you to have a ready made coop, and girls that want to be involved in their care. I will caution you, however, a coop that looks awesome to human eyes, may not be practical for the chickens. Take prefab coops for an example, they can be great, but often need tweaking to make them safe and/or practical. If you'd like, you can post pics of your coop and we can let you know if we think something might be changed, be fore you get your chickens, when changes are harder. I hope yours is just perfect! Either way, we always like to see the pics on here, even if it makes us jealous.
Welcome to our FUNomenal community! 
Best wishes and have lots of fun! 
