I don't know if you've played with it or not, but the new version of Hulls from Carlson Design is quite a nice freeware package for playing with S&G designs. Complete with visual panel layouts on whatever size sheets of material, and with an offset table. It also has a rather nice results summary for when you've decided to "add water" as it were.

The usuall disclaimers about no vested interests, etc. It's just on my PC and is fun and easy to play with. Available at http://members.aol.com/ghartc/index.htm if anyone is interested.

> Part of the reason I give the S&G Guillemot plans away for
> free is the panels were not generated by a CAD package. I did the
> panel development by "hand" using a scale model. I would
> make a scale model of the modified boat to see if the panels work
> as expected. I would tend to change the height and width dimensions
> proportionally to maintain the cross sectional shape. The length should
> be able to be scaled at will.