Hi Carl,
Don't be too quick with the saw on the bow. It is very easy to move a transom forward a few inches. Also for a slightly short boat, it is easy to extend the existing hull shape by bending a piece of formica or bendable plywood around the outside of a hull aft end and then let it extend aft to the desired overall hull length. Next wax the inside surface and build the extension inside this quickie mold.
Bill