The outside stringers firm up the frame. I run mine the whole length of the board and trim them back as needed.
Once those are installed the next step is make the patterns for the nose and tail. To do that I trace nose and tail from the copy board.
Making the nose and tail sections is a lot easier when you have the copy board. I trim down the outside stringers length and height. I also added some transition pieces.
My next step is level all the upper stringers to make a smooth transitions from tail to nose.