Finally! I rebuilt my vent. I used a stainless steel mesh. The mesh is made from 1/16 dia. and the square openings are 3/16. I think it looks OK, but you can see inside the engine room. I need to add something to the back side. But, it cost me $50.00 vs. $600. So, I'll deal with it.
I used starboard for the frame. I cut a groove on my table saw for the mesh. They do make a beige starboard, I used white, because I had some in the garage. Still looks OK.