May not be exactly what you're looking for since mine is plumbed into a fish room but this is mine....
It's a modified version of the rocket engineer stand on my 180 dt (the fish room has 2 more stacks of 2 based on the same basic design). The top frame is made of 2x6 and the rest of the skeleton is 2x4s. The top is skinned using 3/4" ply (which you can't see since it's under the tank) and the sides are all skinned with 3/4 inch ply as well. The finish was done using vinyl wood-look laminate flooring which ended up looking very good and is waterproof.
The modification from the original RE design comes from the fact that I added a bar to the front of the tank. I attached another frame for that to the main stand and skinned it all together. There are more details in my build thread in my link if you're interested.