As to materials only, the local trailer joint will likely soak you for the aluminum. Find a circle track shop for the aluminum panels, it will be far cheaper. Those guys are cheap and used to riveting a whole new body on the race car every weekend. Only difference in the standard panel the circle track guys use is 48" wide, and you will want the 49" wide panels to get the proper overlap at the seams. But the same suppliers have both sizes, if the circle track guy doesn't have them, he can order them on his next stocking order.
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