What?I forgot to come back with pics of the new coop and set up!
There is something busier and more important in your life than keeping US updated?? 
Looks good, not sure why H would want to take her kids into D's nest but yep, seems you need to keep the coop runs separated for now. I would definitely get rid of any visible foam, chickens like to eat it. I don't know what would make it attractive to them. They will also eat rigid insulation.
Bent the tiles over their legs? I can see where that would make for a lot of NON uniformity. But, I guess it was a tool they always had available.

Because she's a chicken??? No idea! I'm guessing because it was where she a/ lived before she went broody b/ sat the whole time she was broody and c/ where she had the babies and the first time it was only after having had 1 night in the new coop the 2nd time I'm not so sure as she'd had 3 nights by then. Maybe because she is Hermione the warrior silkie and that is where she wanted to sleep
and yes the old ones look gorgeous on a house roof but the new regular ones for the under layer (pointing up) makes for a much more waterproof roof on a house 