How can I create a smooth boat hull tip like the AquaRiva one?

 From:  simba
6639.1 
Hello,

I tried to create a boat hull using loft bur I keep running into problems at the boat tip. Well, there's the tutorial video for the AquaRiva by Andrei Samardac but unfortunately he doesn't go into enough detail about the basic hull design process and I am not able to achieve something similar. How can I get the loft curves to close smoothly?