Scott,
You describe your half-canoe correctly. It is planked in the smoothskin lapstrake style, with overlapping planking edges thinned so that they make a smooth hull inside and out. The original Craigslist photos and text made it appear to be a strip-built canoe, which was common from Canadian makers- strip-planked hulls were made up of many narrow longitudinal planks.
The smoothskin lapstrake style was used by multiple builders though it may be best known in canoes from J.Henry Rushton. Without decks, gunwales, etc., it's not as easy to identify who built this one, but it's not built in the typical Rushton fashion and it does have some elements that look Canadian. If no one else posts info right away, I hope to get back to my old catalog files soon.
I wonder if you could get a better photo of the deck from the other half and post it here.
Michael