Finally built the stand over the weekend. We used 3/4" plywood, its a pretty simple desgin, and if you are wanting to build one like this i can give you some diagrams or a SketchUp model. Its amazingly sturdy too. The stand is nearly finished, just need to finish it and put some doors on and were set.
Stand=Free (had the wood lying around) idk how much a sheet of plywood costs

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40 Gallon Reef: 80lbs LR, 250w MH, 15+ gal Sump, AquaC Remora, Koriala #2,#3
29 Gallon: My yellow angel (Sonny), 6 neons,7 other tetras and my CAE...ugh. hes huge