This is what I did, box is two 2ft square frames held together at each corners, made from old angle iron bed frames, sheet metal is about 10 or 12 gauge sheet cut to fit in frames.... Threaded rods are passes through some 1 inch id tubes through box... 4 pieces of 2 inch ABS plastic inserted vertically for tool holders.... Not shown is 2 inch angle put on back side and attached with the threaded rods for using as a point to add trailer ball or tow chain for home harrow or for what ever reason to attach something....
It is 2ft X 2ft X 1ft and weighs in around 500 pounds..
Dale
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