I made something almost identical to that for about $10. It works great. I bought a window screen kit from Ace Hardware along with a roll of adhesive backed magnetic strip. My original plan was to use the magnetic strip to adhere the screen to the front of the radiator support. However, I found that I could simply slide the frame between my radiator and radiator support. I then used a strip of the magnet on the top of the screen frame to keep it from rattling around. The magnet holds the screen to the radiator support. I simply remove it after I arrive at a show, and there is no evidence it ever existed. I do not have air conditioning. I'm not sure how this would work with a condenser in place. If interested, I could take some photos.
