I dont beleive no one has said this one yet. In fact Ive only been on this site for a short amount of time, but I havnt seen this site mentioned once and it is a great resource for alot of reefkeeping stuff.
GARF
They have great plans for any size DIY tanks, stands, plenums, and live rock. Just enter your desired dimensions into the calculator and out comes the plans!
Pay them a visit regardless if your a DIYer or not!
I used their plans to build my 180g plywood tank, and a slight variation of their stand. It is a freshwater tank, but if you would like to take a look it is
here