I was inspired to make this after watching a Japanology video on Bonsai via youtube. The programme showed a image of the first penjiin gift from China to Japan with featured simliar tray. Just lifting it feels so much better/safer than lifting such a large tray 1500mm x 700mm without handles. I'll make a chunky stand for it and eagerly wait for spring where I'll do a saikei with a large Banksia serrata. Timber is bluegum and recycled bluegum floorboards.
I should have said decking boards not floorboards i.e. no tongue & groove. Each board has 3mm-5mm space between and sit on a 25mm rail screwed to each side/end. I left gaps at joins and corners where rails meet sides to improve drainage and aeration for the timbers longevity. On top of the boards will go a loose fitting layer of polystyrene (brocolli case lids) before a layer of coarse scoria in all gaps and corners.