to make a powerful bow, you are not going to use an elastic string. Elastic strings will wear out after about a dozen shots, so they should not be used. also, they get weaker and more stretched out a little every time you use it. It is the bow itself that should bend. After all, a bow can bend very far and almost an infinite number of times. the barrel and stock would be best if made from plastic or would because wood is flexible and strong when plastic is smooth and durable.