Good afternoon,

attached is a simple sheet metal box with a cown cut in the top.  I want to know how/if possible, the corners can be bent away from the body so that the bend is a full radius and the sides meet to close the corner.  The bend should end approximately 3/4 away from the body at a 30 degree angle such that the max width is 8-1/2 from corner to corner.

Any thoughts?  I am happy to reconstruct the top such that it is a closed roof bend up on all four sides.