I have a bunch of air dried walnut that I've never used for anything. So, I'm thinking about making some flag boxes out of it. You know the triangle shaped display boxes for memorial flags. Well, the expensive part is going to be the glass. Triple strength glass isn't cheap but it is less likely to break than single strength. I'm wondering if acrylic would be a suitable substitute. I know that it will yellow if left in the sunlight over time, right?