They are a sweet little boat and I have one of those "building thoughts" for my Grand Daughter.
The Rob Roy and Wee Lassie look very similar. You sit basically on deck in the Wee and sit in a seat in the Rob. The lower center of gravity in the Wee may make her a more stable boat. I would look into the 2 of these and try to figure out the history of the hull........ there is a little history of the connection between these 2 boats on the Bear Mountain link:
The Rob Roy " Truly the poor mans yacht, the origin of the Rob Roy goes back to England and the mid 1800's. John MacGregor, after seeing our native birch bark canoes and the Eskimo kayak, designed his idea of an efficient cruising canoe, calling it the Rob Roy. Typical of this type of solo canoe were: length 12' to 15', propelled with a double blade paddle from a sitting position and often rigged for sail. Early American canoe builders like J. Henry Rushton and W.P. Stephens were influenced by this style. Until the early 1900's, American recreational canoeing was dominated by the double paddle canoe."
The original Wee Lassie, an undecked double-paddle canoe, was created in the late 1800s in upper New York State by a canoe builder named J. Henry Rushton.
Some links for you:
Wee plans at Feather Canoe Rob Roy plans at Bear Mountain Michne page on building the Wee Michne's page is a great spot for info. Check out his work.
This picture was taken of a Wee at the North House Wooden Boat Show this past spring. The guy had 2 of them. Very sweet and I could not keep my eyes off them. He paints the outside and does the usual on the inside. I liked the look.