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I wasn't sure how much the materials weigh so I did some searching online for very similar materials... comes out to 96.25lbs est for the cap. That doesn't sound too bad at least not on top of a pickup.
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It's good you're doing some estimating. Add maybe 10% for stiffening ribs, flanging, brackets, hinges, etc.
The reason I compared the [unknown] weights was to suggest not to expect a rigid sheet that weighs 2 pounds to conform to an open net that weighs 1/2 pound. The mesh is redundant. It becomes a question of how to shape the sheet material.
When Art Arfons was making his jet-powered car for Bonneville in the 60s, he famously rolled the sheet metal around the trunk of a tree.
What is the cost of the 18ga sheet steel? Look at
PolyMetal™
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Product Description
PolyMetal sign panels are comprised of a recycled thermoplastic core sandwiched between two sheets of finished aluminum on one or two sides. The recycled thermoplastic core lends itself to resisting moisture. PolyMetal panels also feature the ability to digitally print direct to the panel, thereby allowing for complete design flexibility.
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I weighd a piece 15x7.5" and it weighs 10 ounces. It's available locally at three price levels. Right-off-the-street is about $150 for a 4x8 sheet. It also comes in 4x10 and 5x10 sheets.
Prefinished. You'd have to paint the steel.