Just a quick note, that stand needs more support on the edges, two more pieces of 2x4 at each corner. The whole weight of the tank is resting on 5 pieces of wood at the moment. There is nothing stopping each corner from buckling under the weight of the tank. It is nearly there but with the added extras it will be well supported.
The inside of the top and bottom of each side should have another piece of 2x4 across the width of the stand, also as it is a 72" stand, you NEED another support in the middle.
i have them there that was the rough draft of it.the only thing i have left is to add a center brace in the front..i plan on kickin that wet dry for a 55 gallon sump when im done with it.