You may have what we’ve called a hybrid. Seems as though the original owner of Kennebec hired several builders that worked at BN Morris previously, and they employed Morris build methods in the early years. I agree that the under structure on the decks does not look like Morris, but the stem/gunwale photo does look like Morris.
I haven’t personally seen a lot of hybrids, but the ones I have seen had hardwood stems. Morris used cedar. That could be your defining feature.
Here is a 24” Morris deck with 1/4” book matched deck halves. They came out well. Need to steam them.