That would most likely work since the top is recessed on an aquarium with a ledge going around it. You would just need to consider a way of lifting it off (like having a hole drilled for a finger to grab, or a magnet on each side to give a lifting point, etc.)
I think the aquarium setup makes the whole display look like **** though. I wouldn't invest $700 in a collectible and then house it in something so ghetto personally, but I can't fault someone for doing so given how expensive acrylic is in this size. The black plastic borders and visible silicon just doesn't sit well with me. I've kept fish for years though, so maybe I am biased. Just an opinion where taste is subjective.