Every time you make a model, you have to decide how much detail you need, and balance that against how many faces and vertices you use. For now, you will make a simpler version:
Press A to deselect all of the control points.
Press theMMB and rotate the view so you can see the top and side of the sloop, as shown in the following screenshots. Look at how complex the surface is.
In the Modifiers subpanel of the Properties window, set Subdivisions: View: to 1, as shown in the following screenshot. Note how much simpler the surface is, compared to the preceding screenshot.
As usual, there is a little more massaging to do. The simpler surface does not have a subdivision in the correct place.
Press Numpad 7 to get the Top view.
Look at where the template shows the edge between the cabin and the cockpit to be, as shown in the following screenshot. You can see that the control points lie over the boundary between the cockpit and cabin, but the edge of the Subdivision...