Unfortunately there are no ´ready to shape´ blanks like for usual "normal" Boards, where manufacturer like Clark-foam offer hundreds of different close-to-finish blanks. To make a balsawood board the blank needs to be made first. Depending of the size of the raw balsa wood pieces a handful of them have to be glued together to give you a full size blank. To increase strenght of the blank one or multiple stringers are glued in between the balsa wood pieces. The demonstrated blank has a 18 mm centerstringer and two 9mm additional stringer made from multiplex wood. After about 6 hours of work with the power planer the rough looking blank got shape. From the same material the stringers are made of, inserts for nose and tail were made to increase strengh as you can see in the following pics.