I have a customer who needs a 4x8 double sided basic sign with vinyl and printed logos. He is getting a metal frame welded so it should be protected on all sides, it will have a 1/2" lip/track for the sign insert. He is very worried about any rotting and doesnt want to be replacing it. He likes the thoughts of alupanel but would need 2 sheets with a centre insert for stability, so I suggested the 1/2" Nualum but it has the wood inbetween but the thickness to be solid. I just came across Alumacor 10mm with hicore inbetween. Any thoughts? He also wants to use the same product to put tracks on both side for changeable letters. Thanks in advance.