Aquarium under my bed?

I really want to add another aquarium into my room, but don't have enough space for the size I want. I thought of a great idea, and I'm trying to conserve space.... so do you think this would work? What if I got like a 50 gallon aquarium and had it underneath a loft bed/bunk bed. Are there any safety reasons that I shouldn't do this? And if I could convince my parents (tips please?), how could I make this work? Would I buy a loft bed online and build it over my fish tank? Could I build one? Thanks. This would be my ultimate dream, as fish lover! Sorry this is a weird question. :)