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That is almost exactly what I do, except my coop is 18-inches up and I don't have a trench but the hardware cloth is attached at the bottom then goes to the ground and out 24 inches.first off I welcome you to BYC!
roosters fight to protect their hens but the rooster wouldve got killed instead
Use the 1/2 hardware cloth to cover all holes
a mink can fit through a quarter sized hole
digging predators can be stopped by a hardware cloth 'skirt'
my duck house is a shed. one foot off the ground. i dug trenches all around it that were one foot deep and 2 feet wide. I got 4 ft wide hardware cloth and attached it near the bottom of the coop and it goes down into the trench , bends, and then out the 2 feet. (then I refilled the trenches with dirt.)