Hi "nickoftime",
You've posted all over the place so it's hard to know where to respond, but yes, this is a C.P. Nutting. The decks are one of the diagnostic features, but Nutting used multiple styles of deck. This is one of several. Nutting canoes are similar to those of other Charles River-area builders, including the un-tapered ribs (same with in the floor as at their ends). Another feature of Nutting and some of the other area builders is the use of a chamfer on the bottom inside of the inwale that tapers out to nothing at each of the locations of the thwarts and seats frames. You may see in some photos in Nutting threads a 1/2" or so gold stripe just under the sheer line that follows the sheer to the ends - this is a typical paint scheme from Nuttings (at least it occurs on a number of them but not, to my recollection, on others.
Hope this is of interest.