We just need chainmail armor for the chickens... 

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Yeah look and it just needs a crack… the challenge is real people… us versus the predactors.I'm hooked on these pictures like watching a train wreck.
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What is an apron? Other the thing you use to keep clean when cooking?I agree at least 3' up sides and some apron. On my run the sides are chain link covered by chicken wire now covered by hc!.I only have feral cats as predators (which keeps down rodent population). I used to lock hens in coop but now I leave open since run is so secured. My gate latch is swivel dog lead latch though. ( takes thumbs) !!
Locks on outside gates to larger yard now… I put screening up and then grew vines on the side of the big enclosed chicken area that can be seen from street… camouflaging where my coops and houses are is now a thing making them look like garden not chickens.
I purposefully build our coop as short as our privacy fence is tall and I don't advertise them. My coop is tucked in corner of yard so not obvious to anyone.
Anyway I'm glad you are getting to expand their space and good luck.
Good examples of anti-dig apron installation.What is an apron?
Thank you.Good examples of anti-dig apron installation.
If rodents are prolific, burying the apron ~12" would be good.
https://www.backyardchickens.com/threads/wire-around-coop.1110498/#post-17093528
https://www.backyardchickens.com/threads/new-coop-project.1169916/page-2#post-18481208