Even with the double layer of fencing raccoons can reach right through chicken wire. Replace that with hardware cloth or put the little coop inside the big one and add hwc to the big one too.
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Unless you have Silkies, Frizzles, or some other chicken that can't fly, your 8-week-olds can probably fly up to a roost 8 feet high or more if they want to. They should easily be able to make it up a decent ladder if they want to, even a Silkie. I don't know how high they have to go but it's a matter of training then to want to get up there, not that they can't.(they probably won't make it up the ladder to the coop)
Chicks are 8 weeks.