I used pallets and am in the process of building the coop like you described my DH is actually building it, I am posting the pictures I have so far so you can see how we did it, my 2 son's took the pallets apart we did buy the recycled plastic flooring for the coop part for easy cleaning and we are using shower walls for the coop for easy cleaning we are building the last wall today the one with nest boxes and the door for my storage area. when we get that done I will post pictures for you. here is what we have so far
coop door for chickens
the girls side has the gray floor
my storage space where we will have door to coop part for cleaning also puting a flip door on the bottom for cleaning
here is the base that we started with
Hope this helps, remember to listen to you body I have found when I don't I pay for it for days this has been project for a few months so we have taken our time.
coop door for chickens

the girls side has the gray floor

my storage space where we will have door to coop part for cleaning also puting a flip door on the bottom for cleaning

here is the base that we started with

Hope this helps, remember to listen to you body I have found when I don't I pay for it for days this has been project for a few months so we have taken our time.