i was going to put this before the pic of the sheetmetal with all of the plate steel and clamps on it, but cannot edit the post now...
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and when you don't have a sheetmetal brake.... you improvise. the big "U" tunnel will be under the seat, so the hammer marks are a non-concern. I did decide to go with a 3 piece setup for the front half of the tunnel. just so it looks a bit better. I need to practice my welding though