With the general trend towards lighter, simpler rowboats and sail and oar boats, these very efficient designs use minimal materials and the designs are free.
The single sheet Baby is terrific

two sheet Big Guide a lovely minimal sail and oar design

His new web site is here
http://flo-mo.weebly.com/index.htmlread more here
http://forum.woodenboat.com/showthread.php?117707-Little-Guide-a-one-sheet-canoeand here
http://forum.woodenboat.com/showthread.php?118605-Another-two-sheet-rowboat-design-quot-Big-Guide-quotBrian