This is a FREE design template to partner the 'Dinghy Building: Houdini' web page: http://chrismolloy.com/www/p130
This design contains router templates for the centrecase and the frame member used in frame #3 and #5. Note that the centrecase template combines the two ends into a single template (i.e. part of the template is used to shape each end of the centrecase).
The template is designed to be applied to a P3 material sheet. I can recommend the double-sided whiteboard as a suitable material.