I like the plan. More peppers is always superior to pretty rock walls. How are you going to till that in near the rounded fence? Carefully?
Speaking of the fence, I'm sure you think it will keep them from escaping, but you're wrong. One of these nights, you'll wake up for seemingly no reason and find a cute little Aji Lemon Drop sitting there...watching you sleep. You'll blink your eyes and it will be gone. Was it even there? The next morning the plant will be in your garden looking all innocent, but you will start to wonder. "Did I plant this here? I thought this was a Red Bhut. Did I even plant Lemon Drops at all this year? Wait. Where exactly is my Red Bhut?" Too late. That's how they get you...