Unless you know how to read the boards, your chances of making a bow out of them can be risky because more often than not the grain is violated in some way. Hickory is super strong and is almost impossible to break, IF the grain isn't violated. If you make bows out of a tree, you know what you're working with and you know the way the grain flows. When you get a sawed board, well, the saw cuts often violate the grain. Some boards do follow the grain and board bows will work, you just have to know how to make them. I personally have never made a board bow, but I know people who have. You may want to try making a bow out of a tree...then you can try another board bow once you get a few bows made.