Lots of good information in these forums. Try a search of the forums for many of the questions.
We have a FAQ section for sailing questions that have been answered: http://www.hobiecat.com/community/viewforum.php?f=18
There is a specific post on the soft / delamination: http://www.hobiecat.com/community/viewtopic.php?f=18&t=1156
Do not fill the hulls with "Wall filler". This will hold water. There is debate about filling with an appropriate closed cell - floatation foam. I say no... the stuff is heavy and will still tend to trap water.