Step 4: Foldin'

To fold the bowl, lay it face down on an edge, like a step, with the line of holes on the edge.  Lay down a towel to protect the surface of the sign.  Stand on the sign.  Hit the metal with a mallet until it bends nearly 90 degrees.  Repeat for the other long side.

Put the corner tabs on something like a fencepost and beat them to about 45 degrees.  Do the same for the short sides.  Everything should come together in a general bowl-like shape.  The corner bolt holes should more or less overlap.