Here is the answer I got from Marineland regarding warranty with a different stand, I'm just going to get a custom stand , and have the plans approved before I buy it.
"Because all of our stands have been tested and verified that they can hold that much weight. It is not just the strength of the material, but how the stand distributes the weight of the tank, and where it has contact with the tank. On an unapproved custom stand, you get only a one year warranty. If you want the stand to be approved, you have to send the stand design, and pictures of the built stand in to us. We have the engineer look at them, and go with his findings. BREX"