The following is a response I received from Mac McCarthy on the subject of strip built sneak boxes. I have also put in a pic of Mac in one of his famous Wee Lassie's. Thanks Mac for the info.

One of my students who built a Wee Lassie at Wooden Boat School,
built the Sneak box as a second building effort. The plans for the sneak box
came from Chapelles book Small sailing Craft. Large scale plans for this boat
are available from the Smithsonian, with a table of offsets. I have an
origonal copy of the book that I bought when I was twenty, and you can read
the table of offsets. I understand it is difficult to read the table of
offsets in reprints of this book..
The sneak box takes a lot of strips, but the student enjoyed rowing it, and
was rigging it up to sail the last time I talked to him. I have never built
one, prefering the melon seed, as a more versatile day sailer. I do not
have full sized patterns for this boat. Hope this has been of help.... Mac