Here are a couple of pics (below) snipped from a couple of websites published by Selway-Fisher. Both pages feature one of their canoes in double outrigger mode.
You can click on the links to both pages and visit their sites for more information, including building plans.
The first snip comes from this webpage: http://www.makeacanoe.com/canoe_bits_and_pieces.htm
And the 2nd comes from this webpage: http://www.selway-fisher.com/Sailcanoe.htm
