Go to this sight and scroll through the patterns, look at the boxes. http://www.finescrollsaw.com/order.htm They are mostly made of hardwoods. I have cut out the "Five Dragon Box", (have not finished it yet). I use hard woods and there is nothing fragile about it. If you click on one of the boxes, it shows a larger picture plus when you scroll down there are pictures of the box that others have made. Most are lined with something which also adds strength, but it is not necessary. I like lined boxes because you never know what people will put in them and small items would fall out if not lined. Again this is all just my thoughts, and yes BB will work fine, ,,,, but.. would not be my preference.