Howdy neighbour
Welcome!
Yep, I would definitely swap the nest box and roost levels over. The nest boxes will be fine on the ground. I would leave the floor in so that when they are sleeping and pooping on the roost it does not drop into the nest boxes and/or their food and water. Also, with the floor, it will be easier to clean.
They should be fine on the roost with it ‘open’. If you close that small area it might get too hot in there, especially with the cgi and depending where you are in Aus, our current overnight temperatures.
Are you going to be free ranging them at all?
As
Diva has mentioned, do pop in to the Aussie thread and say G’Day, you will be welcomed.
I hope you enjoy being a BYC member. There are lots of friendly and very helpful folks here so not only is it overflowing with useful information it is also a great place to make friends and have some fun. Unlike non chicken loving friends, family and colleagues, BYC’ers never tire of stories or pictures that feature our feathered and non feathered friends