Engineer Grade galvanized steel reflective directional sign panel

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I'm putting together a quote for parking garage signs. The specs list "Engineer Grade galvanized steel reflective directional sign panel" We've always used .080 aluminum and sheeted with HIS or regular reflective in the past. Anybddy making these type of signs with galvanized steel? What thickness should we use if we do use galvanized steel? These signs need to meet NYSDOT MUTCD standards.

 

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Think I'm gonna just quote this with .080 aluminum. I can't find anywhere that uses galvanized steel for these signs, they aren't big, biggest is 3'x3'. I could see for overhead highway signs using galvanized steel.