I have an old fridge in the garage that is missing the pan that sits under the freezer to deflect cold air away from the refrigerator section and also catches water if the freezer happens to start defrosting (it's the piece with the Kelvinator logo in the attached picture). They're pretty impossible to find, so I thought I might just bend one up and weld it. What's the ideal thickness? I was thinking 18ga steel, but I'm wondering if that might be overkill. Would 20ga be rigid enough to keep from bowing, even if it got water in it?