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4 Simple steel troughs needed

Hi there :) I need 4 troughs made up 2020 long x 150 x 140 (see picture). It's for a DIY living wall feature I am making for my tiny house, so the troughs will have water in them to 20mm deep and then pots with plants. The steel they are built out of needs to be fine with long term water storage. The weight it will hold is about 30 kgs per trough so the steel needs to be reasonable strong (Open to suggestions on how thick). I can paint them myself or leave them natural. Thank you!