You're welcome to try any of the free tiny solo sail-and-paddle boats on
my website www.ncf.ca/~ag384/Boats.htm . They're all experimental light
weight cheap boats. I have a lot of fun with them. Of course short boats
are slow.

There are lots of links to free designs at www.boat-links.com.
Gavin Atkins has quite a few free small boat designs. Go to
www.duckworksmagazine.com and search on his name to link to his website.
lso search Duckworks for Richard Frye's kayaks for fishing.

www.gaboats.com has light skin over frame boats which are more time
consuming to build than plywood boats, but much lighter.