I think the ridgidity of ACM would be awesome on belly pans and it can be rolled bent etc quite easy.
ACM SIGN PANEL FEATURES
• Light Weight
• Rigid and Durable
• Accepts Vinyl Graphics
• Excellent Outdoor Weatherability
• Stock Sizes - 48” x 96”; 48”x 120”
• 60” x 96” & 60” x 120”
• Custom Colors & Finishes • High Strength
• Easily Fabricated
• Weather Resistant
• Accepts Screen and Digital Printing
• Available in 3MM & 6MM Thickness
ACM Panels
its cheap too did I mention that part. I will probbably build my chin spoiler and kam back from this.