Definitely not ACM. I think its a Vicwest steel product , either AD275, or AD300. Either way its a concealed fastener system.Doubt it's ACM, just thin sheets of steel or aluminum likely. Seeing how bad it's oil canning, I'm guessing it's a Kaycan product.
Rainy days with soft light make any material look good.
Stucco would like a wordRainy days with soft light make any material look good.