perimeter chicken tunnel???
i think this kind of palette could fit your lower terrace and front of house garden beds = dry garden with grasses, clipped shrubs, windswept trees, open wood fence
Fire pit on terrace lawn
somewhat illustrates the 'feel' of your backyard in that it shows deck to terrace to wildness.
continue terrace theme beyond the main grass terrace but with more wild native plants? core ten edging
Sage -goes with daisy, coastal cushion bush planting for boxes
here is a space saver amazing idea = modern, minimalist chicken coop with a garden on top.
star jasmine as a ground cover for retained wall to side of house if you want to go exotic and are happy to maintain to ground spacing = 500mm
paint your boxes black with gravel surrounds = nice
Simple transition deck to terrace lawn