Any of the Instant Boat books by Dynamite Payson. They focus on a standard method for building a number of Phil Bolger designs, using basic ply and dimensional lumber materials. Step-by-step execution plans for the general method are covered with lots of pictures. My first home-built boat was a Gypsy from the New Instant Boats book.
Dave Gentry Custom Boats - designed for home builders, including kids. Several skin-on-frame designs. Got a Boardyak hanging in my garage right now that my daughter and I lashed and sewed together together.
If you’re looking for something a little smaller - I came across a copy of Build Your Own Radio Controlled Yacht at our local Half-Price Books. Includes full size plans and step-by-step instructions. Also has a fairly active online community, not dissimilar to this one.
Yeah nothing that fancy this is a boat to enter in the community “Anything that floats” race. Max budget is $20 per the rules. Think lots of duct tape.
Here is an entry from a few years ago with the twins. We came in second… Of the 15 or so entrants all but 5 sank or capsized.