Take your tape measure, go to a Restaurant supply place that has lots of used equipment. See if you can find a heavy duty stainless mixing bowl. Cut the bottom out.
Or call around to sheetmetal shops ask if they have any stainless strips from previous projects, if you find a friendly shop the will cut it too size, fold a the two long edges in a brake so you won't cut your hands, and either spot or tack weld to form a circle, you might be surprised how little they would charge if you promise them a couple smoked butts.
Or call around to sheetmetal shops ask if they have any stainless strips from previous projects, if you find a friendly shop the will cut it too size, fold a the two long edges in a brake so you won't cut your hands, and either spot or tack weld to form a circle, you might be surprised how little they would charge if you promise them a couple smoked butts.