I read that book, and others as well. I didn't see any imperfections in the authors' gardens. Not very realistic that.Mine are confined away from the garden and yard plants so they can't tear those up. But if they try scratching up fruit trees we put bricks around the base. I'm not sure what they're called, but we also use the black ground tarps.
As for the chicken garden, well, I want to do a grazing box. It's a wooden frame with wire over the top. Google it and you'll see what I mean. I'll also probably do some wire around them. I don't have many plans beyond that because I'm new to chicken gardens.
I recommend the book Gardening With Chickens by Lisa Steele. I started it, I didn't finish due to an overabundance of books, but it seemed really good and I like Lisa's other books.
Good luck!