As the title says. I plan to have about 150 pounds of sand and about 50 pounds of driftwood. I have a 65 upstairs as of now. I have had a marble and oak wardrobe that weighted about 1200 pounds upstairs (We had to take it apart piece by piece to move it up) in the room next to mine and been there for 6 months without any problems. Would this work? (I have no idea how to contact a structural engineer)