That's a good idea, but if I am understanding it correctly supports come up the sides? I plan on having the front and sides viewable, so I don't know if I want metal bars getting in the way on the sides.
I don't know how the other idea attaches with the overflow in the way either. I did a quick SketchUp model of what I think you are talking about. It isn't to scale and I messed up the length on one of them, but it gives us an idea of what it would look like.