Is that really your Set Up or is that a pic of Fort Leavenworth Military Prison?Along the lines of what @morganalefae was saying, instead of doing all that digging to bury the hardware cloth you can just bring it out away from the fence line (like an apron) and use landscaping pins to hold it to the ground. Eventually the grass will grow through it, you won't even see the fence and you can mow right over it. That will save you so much time and will spare you a lot of aches and pains! You can see in this picture where I had just finished replacing my woven wire fence with hardware cloth, how it is lying flat over the ground. In just a few months it looked like the far right end where the grass had already grown through the hardware cloth. I brought mine out 18".
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Also, I would use U-nails to secure any fence or hardware cloth to your coop. I've heard stories of big raccoons pushing or pulling through fence that was only stapled.