Getting ready to build a stand for my 75 acrylic tank. I had wanted to have a clear span left to right on the 4ft tank if possible. Wanted to build the inner frame out of 2x4s framed like wall left side and right, but was thinking about using 2x6 on end with 3/4 furniture grade ply top. Any thoughts it it would sag? Stand need to be strong square but not pretty. I have sheets of brushed stainless that I will cover it with ....