I finally finished and installed the new oil cooler guard. It's been about a month since I started building it - I guess the cold garage has slowed progress.
I started by making a form for the frame and bending a 3/16" rod into the shape. Then I welded the frame together and tacked on tabs for the corners. I AM NOT A WELDER, I merely own a machine that can weld when in the right hands... But with enough sputtering and grinding, I can usually get two pieces of steel to become one. I tried to weld the wire screen to the frame but failed so I opted for zip ties. A quick coat of aluminum color spray paint and I called it finished.
I'm reasonably pleased with the outcome.