I have to be honest...I"m not a fan of the any tank edges sitting over the tank stand, as it could weaken the seals on the glass over time...what you can do is get a thin piece (1/2" or less) of plywood and cut it to the exact fit of the actual tank foot print, paint the edges black, and place this "table top" directly on top of the stand, and the aquarium right on top..that way the weight distribution is safely accounted for from a long term perspective.
But overall nice work, I like what you've done.