Since you have the templates scaled, you don't need the Reference Block any more. So it's time to recycle it into the hull of the sloop. Using the Edge Tools, you'll stretch and recontour the cube into the sloop:
In the Modifiers subpanel of the Properties window, set the View: button to 2.
Make sure that the Limit Selection to Visible button in the 3D View header is light gray so that you are moving all the control points, not just the ones in front.
Select the left-hand control points. Press G, Y, and use the mouse to move them until the front end of the Subdivision Surface is at the same place as the bow of the sloop in the template, then press theLMB.
Did you notice that as you moved the left side, the right side also moved a little? When modeling Subdivision Surfaces, you get things close and then work them closer and closer till they are just right.
Press A to deselect all the control points. Select the right-hand control points...