I think CP is honestly more challenging to secure. Because the material isn't as strong, it needs more securing. My aluminum is cut, braked, and fitted for the spot. I then drilled small holes and riveted in. Perfect!
CP was a lot more challenging, as it didn't bend as well (for perfect fittings) and securing it always made the sheets tear some. One thing that has helped ME, is that I was working with a car restorer. He has the tools (and lift) and experience to teach me how to do it in a more professional way. Since I've learned about the ease of aluminum (with the right tools, a lift, brake, drills, rivets) I won't go back to my old style (laying on the ground, giant CP sheets, cable ties lol).
(Not trying to debate or argue, just make it clear my perspective, and why. CP is how I started and a great introduction, but to do it best, aluminum. Round 1 (there WILL be multiple rounds...) Is great for CP as you get familiar with the underbody of the car, and how it will actually function.)
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