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Yeah, I had some aluminum left over from the hood vent, really thin stuff. Bent by hand with a block of wood on the edge of a table as a 'brake' since I don't have a real one. I had to hammer most of the edges to be sharper and closer to a true 90 since a hand bend can only get you so close.
I keep forgetting lessons I learn from previous sheet metal projects like drilling holes where bends meet to prevent stress risers, and I never really measured that heat shield very closely, so it got seriously un-square when I bolted it on. But good enough for my needs, it should still do its job just as well.
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