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It's nice to meet you! Please make yourself at home! 

Glad you joined.Yes. Is SoCal I would build an open air coop. I also do not recommend 1/4" hardware cloth. It is very weak. Use 1/2" galvanized HC. If you have a venomous snake problem you can cover the bottom 2 feet with 1/4" cloth to keep the baby snakes out. Also, install a predator apron that extends out 2' and securely attach it to the coop and pin the outer edges with heavy duty landscape pins.So should I be leaving that window open please? tia.

We're so happy you've decided to join us
You can probably get a lot of good ideas from the coop section. Good luck with your birds and have fun...