My dad made me a little black-heart sassafras and Huon pine box for the 1st 10oz bar into my stack. With another 2 oz's it makes a fine little display piece. (Of note is the darker colour after a coat of oil)
Natural materials will tarnished your silver. Let's see what will happened when keeping them in longer term. House did it with his kilo bar.
That's a very stylish box. Didn't house keep his KG in a leather boot? Turned it black if I remember right.
I believe he would make to order, he's got a great many premade but the style I wanted was slightly different to what he usually does. I can chat with him about it if you like?