I bought an 18" WSM from some a$$hat$ that did just what you describe, they used it on their patio for "ambiance". Didn't even bother to move or cover it when they painted the house. Go ahead on and knock yourself out, but hopefully this will persuade you what will happen to it-
I had to replace all the vents as the porcelain finish cracked all the way around the bowl and the aluminum vent corroded, the legs were distorted from the heat.
peaspurple has it goin' on with the soon to be patented swamprb Weber 22" Redneck Firepit!
hope you reconsider