The latest plan is a slight modification in bale layout, mainly to ensure certain plants get more sun and to provide more space for big tomato and cucumber plants. I'll stuff in some greens and flowers, and experiment with growing root veggies in the bales, starting with radishes. If the radishes aren't successful, I'll know early enough to start that area over by planting more peppers or cucumbers.
Meanwhile, I topped the bales with composted straw from last year. It's pretty much dirt now, which means I don't need to pick up a bag of garden soil. Shortly after, my husband built a box around the second row (see photo), which will help contain the bales as they decompose. Not required, but looks nicer.