It's fantastic! It has space for all and is more enriching than just a big empty square!
A 5x8 coop (that does not include nest box space) is big enough by the recommended size for 10 birds.
Since you are just starting may I suggest considering a walk in coop?
It's much easier to tend them...
What a great adventure you have begun!
I love the interconnected tote brooder idea. I imagine it would be hard to get a picture of the whole thing as it sounds very large. I am sure many would like to see how you joined them.