The framing yard at Essex shipbuilding museum, where wooden boats were built from the time of the first settlers in the mid 1600’s to around the 1960’s.
Apparently in the old days people used to actually grow oak trees into the shape of the frames of the boats they were planning to build. That way when you cut the tree down, you could build a frame out of as few separate pieces of wood as possible. Any breaks in the wood meant a loss of structural rigidity, and that you had to use multiple layers of wood to make the rib.
Until the 1880’s, shipbuilders in Essex used handaxes to shape all of the wood, including the frames. Later they used a shipsaw, which is basically a giant pivoting bandsaw with a stationary table. This way you could push a piece of timber through and adjust the saw blade as you were cutting to get the smoothly curved shapes you needed for framing pieces.