Tools needed: tape measure, square, your drawing, and pencil.
Draw the references lines and offsets. Example:
Draw the curves by marking the offset points and using a flexible piece of material like PVC tubing. Bend the tubing and hold in place so it interesects each point. Draw your curve.
Your result will be:
JEM Watercraft plans provide a method to check your work to ensure you've drawn them correctly: Measure twice, cut once.
Cut out you panels:
Tip: If you have mirrored imaged panels, draw and cut the 1st panel, then use it as a template for the other panel.
Sand the edges (Tip: if you have mirrored panels, lay them on top of each other and sand at the same time):
Repeat for all panels.