I can't offer any information on how the kayak handles, but it is a very easy build.

Nick rates it in the easiest category of his range of designs.

Things that can make a kayak hard to build include concave sections, sharply upswept bow and stern, hard chines, and a substantial change in the height of the deck in front of and behind the cockpit.

The Great Auk has none of those features. Building it should be just about as easy as a stripper gets.