Self tapping screws with washers for attachment.How would I attach the hardware cloth to the metal? For both the apron and the ventilation I plan to put on the coop sides and eves? All I can think of is metal zip ties, and that could get pricey cause I'd need a lot of them. I was thinking of pine shavings bedding.
When I had a stationary coop and run I put pavers (I got more basic cheaper ones at the store but this is the roughly the size I had) all the way around the outside, I was in the city so I mostly just had racoons to worry about. But the digging animals go up to the fence and start digging down, they don't naturally realize they can start further back and go under it. Had it that way for years without issue.
Pine shavings is probably best but this video did a good job of describing pro's and con's of the typical options depending on your drainage and such.