Back in the winter of '92/92 I built a 15-1/2 footer with a very similar rig; though on a MUCH simpler hull. I made mine out of 6mm door skin Luan and, by gum, it was still rowing as recently as last summer and may be still. I sold the sail and gave away the hull.
I had the sail made up by Robin Lincoln at Center Harbor Sails. Wrote a construction article on it for Messing About in Boats that made the Nov 1, 1993 issue.
The designer named it the Balsam Swamp Bateau but there was some conflict with a similar boat in Texas (though OUR Balsam Swamp is outside of McDonough, NY). The name was changed to "Budget Swamp Bateau".
The rig is a good performer, though not as efficient to windward as a sloop. I used a single leeboard and a push-pull tiller - which was my own contribution to the design and stolen from a Norwegian design.
The plans called for "build in a weekend". Took me four months though I did gussie it up a bit.
Oh. PS - don't write to the designer for plans. He passed away five years ago when he had a heart attack on his restored 1960 MotoGuzzi.
God, I miss him. The picture below is the same boat on a bowhunting trip to Balsam Swamp. The Luan started to weather after five years or so (there were voids) so dug out the bad spots and laminated in epoxied layers of brown paper shopping bags and then painted it with gray porch enamel.

Still holding up.