If you are not finding much...
Ive had luck making a screen print of the best pictures then importing them into Google Sketchup.
Then you can zoom in and trace any line you like.
When you are done you can delete or move the image away from your lines. The lines can be printed clearly for any scale.
Youll be able to add texture back anywhere since the picture will be on a plane. Texture would be for things like sail logos, windows, people, etc.
Lots of online help
Edit: Here's a demo for a centerboard repair.