I know it's too late for your build, but my aluminum guy (he builds circle track cars, and stocks a lot of aluminum sheets) was able to order sheets in both the standard 48" as well as 49" panels designed to overlap 1" on applications like ours. Not much more money than the 48" panels, just took a few days to get them in. I was wrestling with the same 48"/needing overlap issue until he came up with that solution for me. If you look at pretty much any enclosed trailer out there they are all built with the 49" panels and they usually put them in the brake and put just a slight bend on the last 1" so the edge stays down flat when they are riveted or screwed.
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