 The Portman 36 was then modified by Watkins to become the aft-cockpit Watkins 36 and finally developed into the center-cockpit Watkins 36C.A history of Watkins Yachts notes, "in 1981 a center cockpit version of the W36 was added to the line.This is ironic as the W36 started life as a Coronado 35 center cockpit modified by giving it a new deck/coach roof to become an aft cockpit.