I will send a schematic and a build guide digitally as well as ship an envelope containing the same (please message if you do not want the envelope). The size options are tubs wide x tubs high, IE the completed build in the listing images is a 1 tub wide 4 tub tall (1x4). These racks will hold Greenmade Costco 27 gallon tubs, the Lowes commander series 27 gallon tubs, and the black and red Walmart 27 gallon tubs, interchangeably or homogenously without issue. I also have schematics for the...