The bottom does not need supports as the sides and all the plywood add up to make it really ridged for that type of bracing. Remember the weight will just be pressing down. Just like a table does not have supports running all along the floor and between the legs because the weight will just press down. It does at the ends and front to back so it's all built supported. If you look at the inside pic you can see a 2x4 cut at 41" between front and back and another cut at 471/2" over the top of it. So it's all held together.
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