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Metal
If you plan to MIG weld them then 11 to 16 ga if you are going to TIG then 20 ga maybe 24 ga if your real skilled with a TIG welder I have a 11 ga syrup pan works just fine and a 16 ga sap pan both MIG welded I'm building a 20 ga flu pan right now should be done in the next week or so. No matter what you do you will need to back purge all your welds with argon or use Solar flux type B I prefer the argon back purge over the solar flux but it does work OK if you take your time and apply it evenly on the back of the weld. if you don't do anything to the back of the weld it will sugar causing it to be very rough it's the chromium precipitating or something but it looks nasty and it hard to clean. Stainless does not MIG weld at all like mild steel it's a pain in the /;()$&!! Weld puddle hard to control but can be done I have used Trimix gas and 98 argon 2 CO2 gas the later works better than Trimix on thinner stainless the the helium in the Trimix adds a lot of heat that you do not want on thin stainless just get 304 stainless sheets and use 308 rod or wire depending on your welding process.
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Pans will not wear out unless abused. Many sets of pans are 40 and even 50 yrs old. Those were english tin, SS will last even longer, just don't let them boil dry or get badly dented.
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Thanks. My dads a welder so no problme welding thin stuff
