This is a great cake that seems to combine ideas. Since we're doing a rainbow and flower garden, I thought this was potentially a good approach. I don't think we'd need three layers - two should be enough.
use vertical railway sleepers to create a curved wall raised beds - curved walls may work with overall design better divide between Mediterranean garden and English garden rather than original oblong med wall bed idea
contemporary kitchen idea with higher purple stool white cabinetry white countertop dark purple kitchen island with dark wood top modern black pendant lamps of 50 Inspiring Purple Theme Colour for Kitchen