The six other shops either wanted to sell you a new one or they just dont know how to do fab work. I have cut down alum and like you said you see just the welds. If it were stainless you wouldnt be able to tell at all. When you do stuff like that you want to stiffen where the weld is. It is much stronger if you sleeve a smaller tight fitting piece in the joint spanning 3 to 4 inches both ways of the weld for strength on the inside of the pipe.
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