Thanks' Bob!

I have added curvature lines to each chine but really do not know do I have any changes. I have downloaded some free freeship kayak models and there is no such curves, so it is something in my drawing what I do wrong. To all Freeship users here I post my model so maybe someone can give additional advice for drawing with his software. It is very good but would be good to have some how-to's. If there is some more then users manual would be good to read.

Here is file https://drive.google.com/file/d/0B8FTR7ZmA0mmejVTbktuZlZVdGM/view?usp=sharing