Looks great! Don't worry about the chicken wire. The big girls won't reach far through it and can't do any harm to the chicks. And it will be a good (but safe) lesson for the chicks to move away.
A dog crate - any dog crate - is way too small for 6 week old chicks. Especially for extended periods of time like 3 days without being let out. They can start pecking each other out of boredom, and once they see blood, it can escalate quickly and end in tragedy. I would recommend you start...