I think you should put a couple of Pothos plants on either end of the stand...let them trail onto the floor and it will bring out the green from the tank.
I am no builder so what I think is that if the tank is still on it, then it was built fine. If the tank is on the floor one day, then hey...something gave way.
looks strong enough too me, besides a lot of commercial made stands are just particle board, so if they are strong enough for the tanks they hold your stand should be more then strong enough