16 ga cold rolled steel. Bottoms of the tank are rolled over 90 degrees to help the bottom lay flat. A straight butt joint of the bottom to the sides would be a weak way to go over the long term. The repeated vibration and resonance that the tank will go through on the shit box Michigan roads will rip a butt joint. A lap joint is much stronger in this case. Won't smooth out completely flat, but that doesn't really matter. A skim coat of filler will fix that. I want to grind as little material away from these welds as possible. 
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