A lot of work for what you would end up with. I had a supplier bend/shear some aluminum for me then had someone weld the corners. Real nice box. I figured what was the max size to get out of an aluminum sheet (8' x 10' sheet). Used up every bit of the sheet and got a real nice box for about $200. I'm sure aluminum is higher now.
If I knew how to put a sketch in here I would do it.

Clayton