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I have the magazine and intend to build a couple of the planters this winter. I think i will build them using the Pex decking boards. I intend to lower the bottom at least 4" in order to have deeper soil.
I have a somewhat similar planter now that i am using. It's only 24"x 32"x 18" and built out of pressure treated 3/4" plywood. The bottom is filled with capped and covered 4" black drain pipe.
I sat a tight fitting piece of 1/4" Alucobond with the center cut out on top of the pipe. For insurance, i used 4 pieces of curtain sash core as additional wicks. The thing has worked good for several years and is putting out zucchini and eggplant with abandon.
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