It appears to be the Aroliner Cabinaire model and those standard were 16'. I think it's the angle that makes it look longer. Common motor sizes were 25-40hp. Hopefully someone else has a little more knowledge on these things than me.
Very rare Canadian made Aeroliner Boat from the early 1950s per the serial # of the boat. These boats were built like airplanes with heavy duty riveted aluminum. Boat is 16' with front cab and rounded windows. Front awning window. Windows are original and in good condition. Great conversation piece and much fun in the lake. Has flotation foam in the seat cavities (was advertised as a boat that would always float), has steering wheel rigged to motor. Has vintage light on the bow and railings on roof and bow. A real head turner. (Pics were taken before lights reinstalled. Serious inquiries only. Includes vintage trailer & 1950s Evinrude 25 horsepower motor with vintage gas can to match. A complete package!