The Guide model is a little larger than the Classic. It is wider at 55" at the bottom and has both built in level floors and built in dry storage boxes. The side panels are the same size but could be extended if you want a longer boat. Originally I designed it with an aft bench seat but now I have changed it to have an aft pedestal as well. The boat is designed with the features built in so even though you could modify the classic, this set of plans includes the modifications already d...