A customer had asked about resurfacing a sign for a building they had purchased. They mentioned that the previous sign was lit, but didn't need theirs to be lit. When they dropped them off today I saw the print and graphics were raised, and I am guessing they are vacuum formed. Since it doesn't need to be lit, can I just replace those panels with another material like ACM? I had the fleeting thought to mount something to raised parts of the surface, but I know that wouldn't last any length of time. I don't do installs, so it is a couple of young ladies or one of their friends who will be placing the signs back together, so it would be nice to have an easy replacement for them. If it matters, the sign face is 45"x56.5", and it is 4'x5' edge to edge.