Aahh Stainless, as a young lad it was my specialty for a couple of years. Warpage and learning how to control it can take a while to learn. I used to have to weld SS fume/grease hoods made out of 32 gauge SS. With that uber thin material you would have to tack every 1/8th of an inch to keep it from warping. After tacking you would fusion weld (no rod) the seam. The worst thing about stainless is getting little slivers in your fingers. Its almost like glass slivers as they won't fester and work their way out on their own. I love Stainless Steel!