Wish I could garden here...your's sounds wonderful!
I really hope it does extra well this year.
I found an old small shallow wooden crate in my hubs shed...I know it was one I built a decade ago. It is about 5" deep and 12x18(ish) it should grow lettuce just fine....and I can move it from shade to sun as needed. That frees up space in the garden for more goodies.