The plans I built from are included in the book instant boatbuilding with dynamite payson, the boat is known as the bolger cartopper. A chronological build is available on my blog.
Step 1: Materials Selection
Boats built from wood usually employ exotic "marine" ply or to save on cost "exterior grade" ply wood. Since I just wanted a boat that floats and knew I would be fiber-glassing it anyway I chose a high quality 5 ply 1/4" exterior plywood available at my local lumberyard. My total cost was just under $80 for the four sheets that the bolger cartopper requires. This represents the largest materials expense in building the boat.
The rest of the boat required a small amount of douglass fir lumber, about 200 ring shank nails, 8 yards of 6oz bidirectional fiberglass cloth, 1.5 gallons of polyester resin(If i did it again I would use epoxy resin), and some electrical fence wire(for stitching panels together).
My total cost not including engine was $300