That's a great idea, making the platforms portable. What I had in mind was making a raised garden, and adding cinder blocks for the platforms. They would be hidden with rocks and soil; I envisioned at least some having the openings filled with soil and planted with hardy plants as well as plantings between some of the rocks.
A local arboretum has a nice display where they have flat rocks standing on edge on rows and plants growing between and around them. I never thought of that - I use flat rocks for stepping stones. I hope to try that since it would make a nice cascaded look.
